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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Henry E. 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searchaux" style="display:none">American inventor</div> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox biography vcard"><tbody><tr><th colspan="2" class="infobox-above" style="font-size:125%;"><div class="fn">Henry E. Warren</div></th></tr><tr><td colspan="2" class="infobox-image"><span class="mw-default-size" typeof="mw:File/Frameless"><a href="/wiki/File:HenryEWarren01.jpg" class="mw-file-description"><img src="//upload.wikimedia.org/wikipedia/commons/thumb/2/2f/HenryEWarren01.jpg/220px-HenryEWarren01.jpg" decoding="async" width="220" height="259" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/2/2f/HenryEWarren01.jpg/330px-HenryEWarren01.jpg 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/2/2f/HenryEWarren01.jpg/440px-HenryEWarren01.jpg 2x" data-file-width="708" data-file-height="834" /></a></span><div class="infobox-caption">Warren, 1952</div></td></tr><tr><th scope="row" class="infobox-label">Born</th><td class="infobox-data"><span style="display:none">(<span class="bday">1872-05-21</span>)</span>May 21, 1872<br /><div style="display:inline" class="birthplace"><a href="/wiki/Boston,_Massachusetts" class="mw-redirect" title="Boston, Massachusetts">Boston, Massachusetts</a>, U.S.</div></td></tr><tr><th scope="row" class="infobox-label">Died</th><td class="infobox-data">September 21, 1957<span style="display:none">(1957-09-21)</span> (aged 85)<br /><div style="display:inline" class="deathplace"><a href="/wiki/Ashland,_Massachusetts" title="Ashland, Massachusetts">Ashland, Massachusetts</a>, U.S.</div></td></tr><tr><th scope="row" class="infobox-label">Education</th><td class="infobox-data"><a href="/wiki/West_Newton_English_and_Classical_School" title="West Newton English and Classical School">Allen School</a></td></tr><tr><th scope="row" class="infobox-label">Alma mater</th><td class="infobox-data"><a href="/wiki/Massachusetts_Institute_of_Technology" title="Massachusetts Institute of Technology">Massachusetts Institute of Technology</a></td></tr><tr><th scope="row" class="infobox-label">Occupation(s)</th><td class="infobox-data role">Inventor, business owner</td></tr><tr><th scope="row" class="infobox-label">Known for</th><td class="infobox-data">"Father of electric time"</td></tr><tr><th scope="row" class="infobox-label">Spouse</th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1151524712">.mw-parser-output .marriage-line-margin2px{line-height:0;margin-bottom:-2px}.mw-parser-output .marriage-line-margin3px{line-height:0;margin-bottom:-3px}.mw-parser-output .marriage-display-ws{display:inline;white-space:nowrap}</style> <div class="marriage-display-ws"><div style="display:inline-block;line-height:normal;">Edith B. Smith</div> <div style="display:inline-block;"></div>(<abbr title="married">m.</abbr> 1907)<wbr /></div></td></tr><tr><th scope="row" class="infobox-label">Awards</th><td class="infobox-data"><style data-mw-deduplicate="TemplateStyles:r1126788409">.mw-parser-output .plainlist ol,.mw-parser-output .plainlist ul{line-height:inherit;list-style:none;margin:0;padding:0}.mw-parser-output .plainlist ol li,.mw-parser-output .plainlist ul li{margin-bottom:0}</style><div class="plainlist"><ul><li><a href="/wiki/IEEE_Lamme_Medal" title="IEEE Lamme Medal">Lamme Medal</a> (1934)<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup></li><li><a href="/wiki/John_Price_Wetherill_Medal" title="John Price Wetherill Medal">Wetherill Medal</a> (1935)<sup id="cite_ref-NYT_2-0" class="reference"><a href="#cite_note-NYT-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></li></ul></div></td></tr></tbody></table> <p><b>Henry Ellis Warren</b> (May 21, 1872 – September 21, 1957) was an American inventor, best known as the inventor of the first synchronous <a href="/wiki/Electric_clock" title="Electric clock">electric clock</a>. He has been called the "father of electric time".<sup id="cite_ref-ENC_3-0" class="reference"><a href="#cite_note-ENC-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Biography">Biography</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Henry_E._Warren&action=edit&section=1" title="Edit section: Biography"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Warren was born in Boston in 1872 and attended the <a href="/wiki/West_Newton_English_and_Classical_School" title="West Newton English and Classical School">Allen School</a>. He graduated from the <a href="/wiki/Massachusetts_Institute_of_Technology" title="Massachusetts Institute of Technology">Massachusetts Institute of Technology</a> in 1894 with a <a href="/wiki/Bachelor_of_Science" title="Bachelor of Science">Bachelor of Science</a> degree in <a href="/wiki/Electrical_engineering" title="Electrical engineering">electrical engineering</a>.<sup id="cite_ref-NYT_2-1" class="reference"><a href="#cite_note-NYT-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> He settled in <a href="/wiki/Ashland,_Massachusetts" title="Ashland, Massachusetts">Ashland, Massachusetts</a>, in 1907.<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p><p>Warren is credited, via a patent awarded in 1918, with invention of the first synchronous <a href="/wiki/Electric_clock" title="Electric clock">electric clock</a>, which kept time from the oscillations of the <a href="/wiki/Power_grid" class="mw-redirect" title="Power grid">power grid</a>, as well as with 134 other inventions.<sup id="cite_ref-NYT_2-2" class="reference"><a href="#cite_note-NYT-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-ENC_3-1" class="reference"><a href="#cite_note-ENC-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> He founded <a href="/wiki/Telechron" title="Telechron">Warren Telechron Company</a> in 1912 and served as president of the company from 1914 to 1943.<sup id="cite_ref-NYT_2-3" class="reference"><a href="#cite_note-NYT-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Between 1916 and 1926, the company sold 20 million clocks.<sup id="cite_ref-NYT_2-4" class="reference"><a href="#cite_note-NYT-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> In 1940, Warren invented the "singing clock", which instead of a pendulum had a vibrating metal string.<sup id="cite_ref-NYT_2-5" class="reference"><a href="#cite_note-NYT-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> <a href="/wiki/General_Electric" title="General Electric">General Electric</a> acquired a half interest in Telechron in 1929, and full interest in 1943.<sup id="cite_ref-NYT_2-6" class="reference"><a href="#cite_note-NYT-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> Telechron's clocks remained popular into the 1950s; the company eventually went out of business in 1992. </p><p>Warren's early career started as an engineer for Nathaniel Lombard, designing water-driven machinery for the N. Lombard Improved Governor Company in <a href="/wiki/Roxbury,_Boston" title="Roxbury, Boston">Roxbury, Boston</a>. Warren worked his way up to plant superintendent, eventually purchasing the company in 1937, at which time it was renamed Lombard Governor Company. Warren was owner and president of the company until his death in 1957.<sup id="cite_ref-NYT_2-7" class="reference"><a href="#cite_note-NYT-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>Land donated by Warren's widow in Ashland became the Warren Conference Center—located next to <a href="/wiki/Ashland_State_Park" title="Ashland State Park">Ashland State Park</a>, it is used by companies and colleges for meetings and training.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Examples_of_Telechron_clocks">Examples of Telechron clocks</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Henry_E._Warren&action=edit&section=2" title="Edit section: Examples of Telechron clocks"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul class="gallery mw-gallery-traditional"> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:Telechron_model_355_Cathedral_electric_clock.JPG" class="mw-file-description" title="Telechron 355 "Cathedral" (1927–32)"><img alt="Telechron 355 "Cathedral" (1927–32)" src="//upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Telechron_model_355_Cathedral_electric_clock.JPG/81px-Telechron_model_355_Cathedral_electric_clock.JPG" decoding="async" width="81" height="120" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Telechron_model_355_Cathedral_electric_clock.JPG/122px-Telechron_model_355_Cathedral_electric_clock.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Telechron_model_355_Cathedral_electric_clock.JPG/162px-Telechron_model_355_Cathedral_electric_clock.JPG 2x" data-file-width="1035" data-file-height="1528" /></a></span></div> <div class="gallerytext">Telechron 355 "Cathedral" (1927–32)</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:Telechron_clock_2H07-Br_Administrator.JPG" class="mw-file-description" title="Telechron 2H07-Br "Administrator" (1937–40)"><img alt="Telechron 2H07-Br "Administrator" (1937–40)" src="//upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Telechron_clock_2H07-Br_Administrator.JPG/120px-Telechron_clock_2H07-Br_Administrator.JPG" decoding="async" width="120" height="90" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Telechron_clock_2H07-Br_Administrator.JPG/180px-Telechron_clock_2H07-Br_Administrator.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/a/a5/Telechron_clock_2H07-Br_Administrator.JPG/240px-Telechron_clock_2H07-Br_Administrator.JPG 2x" data-file-width="1600" data-file-height="1200" /></a></span></div> <div class="gallerytext">Telechron 2H07-Br "Administrator" (1937–40)</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:7F72_Heralder.JPG" class="mw-file-description" title="Telechron 7F72 "Heralder" (1930s)"><img alt="Telechron 7F72 "Heralder" (1930s)" src="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/7F72_Heralder.JPG/120px-7F72_Heralder.JPG" decoding="async" width="120" height="90" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/7/7f/7F72_Heralder.JPG/180px-7F72_Heralder.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/7/7f/7F72_Heralder.JPG/240px-7F72_Heralder.JPG 2x" data-file-width="1600" data-file-height="1200" /></a></span></div> <div class="gallerytext">Telechron 7F72 "Heralder" (1930s)</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:Telechron_8B23.JPG" class="mw-file-description" title="Telechron 8B23 "Register" (1946–48)"><img alt="Telechron 8B23 "Register" (1946–48)" src="//upload.wikimedia.org/wikipedia/commons/thumb/9/97/Telechron_8B23.JPG/120px-Telechron_8B23.JPG" decoding="async" width="120" height="78" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/9/97/Telechron_8B23.JPG/180px-Telechron_8B23.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/9/97/Telechron_8B23.JPG/240px-Telechron_8B23.JPG 2x" data-file-width="1486" data-file-height="964" /></a></span></div> <div class="gallerytext">Telechron 8B23 "Register" (1946–48)</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:7H141_Airlux.JPG" class="mw-file-description" title="Telechron 7H141 "Airlux" (1946–57)"><img alt="Telechron 7H141 "Airlux" (1946–57)" src="//upload.wikimedia.org/wikipedia/commons/thumb/0/02/7H141_Airlux.JPG/120px-7H141_Airlux.JPG" decoding="async" width="120" height="90" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/0/02/7H141_Airlux.JPG/180px-7H141_Airlux.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/0/02/7H141_Airlux.JPG/240px-7H141_Airlux.JPG 2x" data-file-width="1600" data-file-height="1200" /></a></span></div> <div class="gallerytext">Telechron 7H141 "Airlux" (1946–57)</div> </li> <li class="gallerybox" style="width: 155px"> <div class="thumb" style="width: 150px; height: 150px;"><span typeof="mw:File"><a href="/wiki/File:7H257_Dimension.JPG" class="mw-file-description" title="Telechron 7H257 "Dimension" (1954–59)"><img alt="Telechron 7H257 "Dimension" (1954–59)" src="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/7H257_Dimension.JPG/120px-7H257_Dimension.JPG" decoding="async" width="120" height="90" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/6/60/7H257_Dimension.JPG/180px-7H257_Dimension.JPG 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/6/60/7H257_Dimension.JPG/240px-7H257_Dimension.JPG 2x" data-file-width="1600" data-file-height="1200" /></a></span></div> <div class="gallerytext">Telechron 7H257 "Dimension" (1954–59)</div> </li> </ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Henry_E._Warren&action=edit&section=3" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20080828183311/http://ieee.org/portal/pages/about/awards/pr/lammepr.html">"IEEE Lamme Medal Recipients"</a>. <i><a href="/wiki/IEEE" class="mw-redirect" title="IEEE">IEEE</a></i>. Archived from <a rel="nofollow" class="external text" href="http://ieee.org/portal/pages/about/awards/pr/lammepr.html">the original</a> on August 28, 2008<span class="reference-accessdate">. Retrieved <span class="nowrap">June 28,</span> 2024</span> – via <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=IEEE&rft.atitle=IEEE+Lamme+Medal+Recipients&rft_id=http%3A%2F%2Fieee.org%2Fportal%2Fpages%2Fabout%2Fawards%2Fpr%2Flammepr.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+E.+Warren" class="Z3988"></span></span> </li> <li id="cite_note-NYT-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-NYT_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-NYT_2-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-NYT_2-2"><sup><i><b>c</b></i></sup></a> <a href="#cite_ref-NYT_2-3"><sup><i><b>d</b></i></sup></a> <a href="#cite_ref-NYT_2-4"><sup><i><b>e</b></i></sup></a> <a href="#cite_ref-NYT_2-5"><sup><i><b>f</b></i></sup></a> <a href="#cite_ref-NYT_2-6"><sup><i><b>g</b></i></sup></a> <a href="#cite_ref-NYT_2-7"><sup><i><b>h</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation news cs1"><a rel="nofollow" class="external text" href="https://timesmachine.nytimes.com/timesmachine/1957/09/22/96026350.pdf?pdf_redirect=true&ip=0">"HENRY E. WARREN, INVENTOR, 85, DIES"</a> <span class="cs1-format">(PDF)</span>. <i><a href="/wiki/The_New_York_Times" title="The New York Times">The New York Times</a></i>. September 22, 1957. p. 86<span class="reference-accessdate">. Retrieved <span class="nowrap">June 28,</span> 2024</span> – via <a href="/wiki/TimesMachine" class="mw-redirect" title="TimesMachine">TimesMachine</a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+New+York+Times&rft.atitle=HENRY+E.+WARREN%2C+INVENTOR%2C+85%2C+DIES&rft.pages=86&rft.date=1957-09-22&rft_id=https%3A%2F%2Ftimesmachine.nytimes.com%2Ftimesmachine%2F1957%2F09%2F22%2F96026350.pdf%3Fpdf_redirect%3Dtrue%26ip%3D0&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+E.+Warren" class="Z3988"></span></span> </li> <li id="cite_note-ENC-3"><span class="mw-cite-backlink">^ <a href="#cite_ref-ENC_3-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-ENC_3-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation magazine cs1"><a rel="nofollow" class="external text" href="http://www.telechron.com/telechron/warren_bio.pdf">"Hentry Ellis Warren"</a> <span class="cs1-format">(PDF)</span>. <i>The Encyclopedia of American Biography</i>. New York City: The American Historical Company – via telechron.com.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=The+Encyclopedia+of+American+Biography&rft.atitle=Hentry+Ellis+Warren&rft_id=http%3A%2F%2Fwww.telechron.com%2Ftelechron%2Fwarren_bio.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+E.+Warren" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFHolcomb_IIIWebb1985" class="citation magazine cs1">Holcomb III, Harry S.; Webb, Robert (February 1985). <a rel="nofollow" class="external text" href="https://www.clockguy.com/SiteRelated/SiteGraphics/RefGraphics/WarrenTelechron/Telechron.TypeA.MasterClock.pdf">"The Warren Telechron Master Clock Type A"</a> <span class="cs1-format">(PDF)</span>. <i>NAWCC Bulletin</i>. <a href="/wiki/National_Association_of_Watch_and_Clock_Collectors" title="National Association of Watch and Clock Collectors">NAWCC</a>. pp. 35–37 – via clockguy.com.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=NAWCC+Bulletin&rft.atitle=The+Warren+Telechron+Master+Clock+Type+A&rft.pages=35-37&rft.date=1985-02&rft.aulast=Holcomb+III&rft.aufirst=Harry+S.&rft.au=Webb%2C+Robert&rft_id=https%3A%2F%2Fwww.clockguy.com%2FSiteRelated%2FSiteGraphics%2FRefGraphics%2FWarrenTelechron%2FTelechron.TypeA.MasterClock.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+E.+Warren" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.warrencenter.com/history/">"History"</a>. <i>warrencenter.com</i><span class="reference-accessdate">. Retrieved <span class="nowrap">June 28,</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=warrencenter.com&rft.atitle=History&rft_id=https%3A%2F%2Fwww.warrencenter.com%2Fhistory%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHenry+E.+Warren" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Henry_E._Warren&action=edit&section=4" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://patents.google.com/patent/US1283431">Electric clock patent</a> (Warren, 1918) via patents.google.com</li> <li><a rel="nofollow" class="external text" href="http://clockhistory.com/telechron/company/documents/warren_1937/index.html">"Modern Electric Clocks"</a> (Warren, 1937) via clockhistory.com</li></ul>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?type=1x1" alt="" width="1" height="1" style="border: none; position: absolute;"></noscript> <div class="printfooter" data-nosnippet="">Retrieved from "<a dir="ltr" href="https://en.wikipedia.org/w/index.php?title=Henry_E._Warren&oldid=1237710001">https://en.wikipedia.org/w/index.php?title=Henry_E._Warren&oldid=1237710001</a>"</div></div> <div id="catlinks" class="catlinks" data-mw="interface"><div id="mw-normal-catlinks" class="mw-normal-catlinks"><a href="/wiki/Help:Category" title="Help:Category">Categories</a>: <ul><li><a href="/wiki/Category:1872_births" title="Category:1872 births">1872 births</a></li><li><a href="/wiki/Category:1957_deaths" title="Category:1957 deaths">1957 deaths</a></li><li><a href="/wiki/Category:Businesspeople_from_Boston" title="Category:Businesspeople from Boston">Businesspeople from Boston</a></li><li><a href="/wiki/Category:People_from_Ashland,_Massachusetts" title="Category:People from Ashland, Massachusetts">People from Ashland, Massachusetts</a></li><li><a href="/wiki/Category:American_inventors" title="Category:American inventors">American inventors</a></li><li><a href="/wiki/Category:American_businesspeople" title="Category:American businesspeople">American businesspeople</a></li><li><a href="/wiki/Category:MIT_School_of_Engineering_alumni" title="Category:MIT School of Engineering alumni">MIT School of Engineering alumni</a></li><li><a href="/wiki/Category:IEEE_Lamme_Medal_recipients" title="Category:IEEE Lamme Medal recipients">IEEE Lamme Medal recipients</a></li></ul></div><div id="mw-hidden-catlinks" class="mw-hidden-catlinks mw-hidden-cats-hidden">Hidden categories: <ul><li><a href="/wiki/Category:Articles_with_short_description" title="Category:Articles with short description">Articles with short description</a></li><li><a href="/wiki/Category:Short_description_is_different_from_Wikidata" title="Category:Short description is different from Wikidata">Short description is different from Wikidata</a></li><li><a href="/wiki/Category:Articles_with_hCards" title="Category:Articles with hCards">Articles with hCards</a></li></ul></div></div> </div> </main> </div> <div class="mw-footer-container"> <footer id="footer" class="mw-footer" > <ul id="footer-info"> <li id="footer-info-lastmod"> This page was last edited on 31 July 2024, at 03:45<span class="anonymous-show"> (UTC)</span>.</li> <li id="footer-info-copyright">Text is available under the <a href="/wiki/Wikipedia:Text_of_the_Creative_Commons_Attribution-ShareAlike_4.0_International_License" title="Wikipedia:Text of the Creative Commons Attribution-ShareAlike 4.0 International License">Creative Commons Attribution-ShareAlike 4.0 License</a>; additional terms may apply. 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