Well drilling tool,申请号US19550499087-传众专利搜索

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发明名称	Well drilling tool
摘要
申请公布号	US2904374(A)	申请公布日期	1959.09.15
申请号	US19550499087	申请日期	1955.04.04
申请人	REED ROLLER BIT COMPANY	发明人	BOICE ELVIN G.
分类号	E21B10/22	主分类号	E21B10/22
代理机构		代理人
主权项
地址

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