Slip for rotary drilling machines,申请号US19290415248-传众专利搜索

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发明名称	Slip for rotary drilling machines
摘要
申请公布号	US1856479(A)	申请公布日期	1932.05.03
申请号	US19290415248	申请日期	1929.12.19
申请人	OIL WELL SUPPLY COMPANY	发明人	GREVE EDGAR E.
分类号	E21B19/10	主分类号	E21B19/10
代理机构		代理人
主权项
地址

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