Oil sealed drilling bumper sub,申请号US19560621169-传众专利搜索

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发明名称	Oil sealed drilling bumper sub
摘要
申请公布号	US2972471(A)	申请公布日期	1961.02.21
申请号	US19560621169	申请日期	1956.11.08
申请人	SHAFFER TOOL WORKS	发明人	MCCLINTOCK ROSS A.;THOMPSON RAYMOND E.
分类号	E21B17/07	主分类号	E21B17/07
代理机构		代理人
主权项
地址

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