Editing Torque wrench (section)

==History==
[[File:JHSharp-TorqueWrench-1931-Model.jpg|thumb|Conceptual illustration of J. H. Sharp's patented wrench]]

The first patent for a torque wrench was filed by John H. Sharp of Chicago in 1931. This wrench was referred to as a ''torque measuring wrench'' and would be classified today as an indicating torque wrench.<ref name="Sharp1">{{cite patent |country=US |number=2007880 |title=Torque-measuring wrench |pubdate=July 9, 1935 |inventor=Sharp John H. |url=http://www.freepatentsonline.com/2007880.html }} {{Cite web |url=http://www.freepatentsonline.com/2007880.html |title=Torque-measuring wrench |access-date=January 17, 2019 |archive-date=January 19, 2019 |archive-url=https://web.archive.org/web/20190119121013/http://www.freepatentsonline.com/2007880.html |url-status=bot: unknown }}</ref>

In 1935, Conrad Bahr and George Pfefferle patented an adjustable ratcheting torque wrench. The tool featured audible feedback and restriction of back-ratcheting movement when the desired torque was reached.<ref name="BahrPfefferle1">{{cite patent |country=US |number=2074079 |title=Torque measuring wrench |pubdate=Mar 16, 1937 |inventor=Charles, Bahr Conrad & Pfefferle, George H. |url=http://www.freepatentsonline.com/2074079.html }} {{Cite web |url=http://www.freepatentsonline.com/2074079.html |title=Torque measuring wrench |access-date=January 17, 2019 |archive-date=January 19, 2019 |archive-url=https://web.archive.org/web/20190119121346/http://www.freepatentsonline.com/2074079.html |url-status=bot: unknown }}</ref> Bahr, who worked for the New York City Water Department, was frustrated at the inconsistent tightness of flange bolts he found while attending to his work. He claimed to have invented the first torque limiting tool in 1918 to alleviate these problems.<ref name="BMWMOC1">{{Cite web|url=https://www.bmwmoa.org/news/379148/The-Most-Important-Tool-Torque-Wrench.htm|title=The Most Important Tool: Torque Wrench|last=Fleming|first=Wes|date=Dec 18, 2017|access-date=Jan 17, 2019|archive-date=January 19, 2019|archive-url=https://web.archive.org/web/20190119121319/https://www.bmwmoa.org/news/379148/The-Most-Important-Tool-Torque-Wrench.htm|url-status=live}}</ref>{{Better source needed|date=January 2019}} Bahr's partner, Pfefferle, was an engineer for [[Dresser Industries|S.R. Dresser Manufacturing Co]] and held several patents.