Well survey instrument,申请号US19300488843-传众专利搜索

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发明名称	Well survey instrument
摘要
申请公布号	US1928969(A)	申请公布日期	1933.10.03
申请号	US19300488843	申请日期	1930.10.15
申请人	UNION OIL COMPANY	发明人	KUFFEL GEORGE C.
分类号	E21B47/02	主分类号	E21B47/02
代理机构		代理人
主权项
地址

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