Gear-operated dual socket wrench
作者： Imboden Winston
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lens.org 参考文章(4)
Charles V Gann, Gear operated dual wrench ,(1946)
Evensen Carl, Bolting-up device ,(1919)
Roy O. Wright, Ratchet gear assembly for wrenches ,(1951)
Henry V Factly, Lug remover for dual wheel assemblies ,(1948)