Double head piston downhole drill,申请号US19620223881-传众专利搜索

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发明名称	Double head piston downhole drill
摘要
申请公布号	US3198264(A)	申请公布日期	1965.08.03
申请号	US19620223881	申请日期	1962.09.17
申请人	INGERSOLL-RAND COMPANY	发明人	OELKE ERWIN S.;KURT EWALD H.;REAUMONT RICHARD W.
分类号	E21B4/14	主分类号	E21B4/14
代理机构		代理人
主权项
地址

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