preshaving
剃前
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剃前刀具 protuberance cutter ; preshaving cutter
剃前滚刀 protuberance hob ; pre-shaving hob
剃齿前加工齿轮齿形用的滚刀称为剃前滚刀。
Before shaving teeth gear tooth shape of processing with hob called before shaving hob.
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