Shock pulsed rotary drill bit,申请号US19530370782-传众专利搜索

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发明名称	Shock pulsed rotary drill bit
摘要
申请公布号	US2706618(A)	申请公布日期	1955.04.19
申请号	US19530370782	申请日期	1953.07.28
申请人	ESSO RESEARCH AND ENGINEERING COMPANY	发明人	BOUCHER FRANK G.
分类号	E21B6/00;E21B7/16	主分类号	E21B6/00
代理机构		代理人
主权项
地址

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