Derrick finger attachment,申请号US19300441414-传众专利搜索

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发明名称	Derrick finger attachment
摘要
申请公布号	US1856833(A)	申请公布日期	1932.05.03
申请号	US19300441414	申请日期	1930.04.03
申请人	FRANK HAMMERSON	发明人	HAMMERSON FRANK
分类号	E21B19/14	主分类号	E21B19/14
代理机构		代理人
主权项
地址

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