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介绍了一种改进型的气动棘轮扳手的结构和操作使用过程，特别叙述了这种气动棘轮扳手的手动换向装置和传动装置，并提出了一些代替换向和传动装置构件的其它构件。
The structure and operation of an improved pneumatic ratchet wrench are described. In particular, manual reversing devices and transmissions of such pneumatic ratchet wrenches are described, along with other components that replace the commutation and transmission components.