Rotary bit operating mechanism,申请号US19500194295-传众专利搜索

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发明名称	Rotary bit operating mechanism
摘要
申请公布号	US2655344(A)	申请公布日期	1953.10.13
申请号	US19500194295	申请日期	1950.11.06
申请人	MCDONALD HYDRAULIC DRILLING CO., INC.	发明人	MCDONALD HARRY W.
分类号	E21B4/02	主分类号	E21B4/02
代理机构		代理人
主权项
地址

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