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Allen key™

noun
🔊/ˈælən kiː/
🔊/ˈælən kiː/
(British English)
(North American English Allen wrench™)
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  1. a small tool used for turning an Allen screw™艾伦螺钉扳手；六角螺钉小扳手
    Word Origin1960s: from the name of the manufacturer, the Allen Manufacturing Company, of Hartford, Connecticut.