Underreamer well drilling apparatus,申请号US19290401925-传众专利搜索

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发明名称	Underreamer well drilling apparatus
摘要
申请公布号	US1896107(A)	申请公布日期	1933.02.07
申请号	US19290401925	申请日期	1929.10.23
申请人	SIMMONS RICHARD P	发明人	SIMMONS RICHARD P.
分类号	E21B10/34	主分类号	E21B10/34
代理机构		代理人
主权项
地址

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