Well drilling tool,申请号US19340752836-传众专利搜索

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发明名称	Well drilling tool
摘要
申请公布号	US2054255(A)	申请公布日期	1936.09.15
申请号	US19340752836	申请日期	1934.11.13
申请人	HOWARD JOHN H	发明人	HOWARD JOHN H.
分类号	E21B4/10;E21B10/04	主分类号	E21B4/10
代理机构		代理人
主权项
地址

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