everyone has one of these. strictly speaking they are not all crescent wrenches but they have become generic and all wrenches of this type are pretty much called crescent wrenches. first patented in 1857 by E.J. Worcester. a patent for an improved wrench was granted to Karl Peterson in 1915. Peterson was one of the founders of the Crescent Tool Co. of Jamestown,NY. what would we do without them?
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