(plural Allen screws)
Allen, the name of Allen Manufacturing Company, and screw
"allen-screw." YourDictionary, n.d. Web. 10 November 2018. <https://www.yourdictionary.com/allen-screw>.
allen-screw. (n.d.). Retrieved November 10th, 2018, from https://www.yourdictionary.com/allen-screw
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