单词	Allen bolt
释义	Allen bolt noun Al·​len bolt ˈa-lən-  hardware : a bolt with a hexagonal socket in its head that is designed to be used with an Allen wrench The Allen bolt is integral to the crank and remains in it when the crank is removed from the spindle. Eugene A. Sloane, Sloane's New Bicycle Maintenance Manual, 1981 Word History Etymology Allen Manufacturing Co., Hartford, Connecticut First Known Use 1972, in the meaning defined above
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