Directional drilling device,申请号US19520273930-传众专利搜索

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发明名称	Directional drilling device
摘要
申请公布号	US2631821(A)	申请公布日期	1953.03.17
申请号	US19520273930	申请日期	1952.02.28
申请人	CALDWELL JOE P	发明人	CALDWELL JOE P.
分类号	E21B7/06;E21B7/08	主分类号	E21B7/06
代理机构		代理人
主权项
地址

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