Origin of Allen wrench
"Allen wrench." YourDictionary, n.d. Web. 13 October 2018. <http://www.yourdictionary.com/allen-wrench>.
Allen wrench. (n.d.). Retrieved October 13th, 2018, from http://www.yourdictionary.com/allen-wrench
(plural Allen wrenches)
Allen, the name of Allen Manufacturing Company, and wrench.
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