发明授权
US4158975A Unidirectional gripping open end wrench 失效
单向夹紧开口扳手

Unidirectional gripping open end wrench
摘要:
An open end ratchet wrench having an arcuate cavity to receive a D-shaped member. The D-shaped member being movable between inner and outer ends of the cavity to either ratchet around a nut or bolt or to apply a tightening force.
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