Bit locking screw,申请号US19350020780-传众专利搜索

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发明名称	Bit locking screw
摘要
申请公布号	US2046025(A)	申请公布日期	1936.06.30
申请号	US19350020780	申请日期	1935.05.10
申请人	LEE ARTHUR L	发明人	LEE ARTHUR L.
分类号	E21C35/193	主分类号	E21C35/193
代理机构		代理人
主权项
地址

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