Valve system for percussion drill motor,申请号US19640413023-传众专利搜索

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发明名称	Valve system for percussion drill motor
摘要
申请公布号	US3307639(A)	申请公布日期	1967.03.07
申请号	US19640413023	申请日期	1964.11.23
申请人	PAN AMERICAN PETROLEUM CORPORATION	发明人	WILDER LAWRENCE B.;BLENKARN KENNETH A.
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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