Retractable rotary well drilling bit,申请号US19560624373-传众专利搜索

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发明名称	Retractable rotary well drilling bit
摘要
申请公布号	US2876994(A)	申请公布日期	1959.03.10
申请号	US19560624373	申请日期	1956.11.26
申请人	LAURANCE GADEBERG BURNETT	发明人	GADEBERG BURNETT LAURANCE
分类号	E21B10/66	主分类号	E21B10/66
代理机构		代理人
主权项
地址

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