APPARAT FOR AUTOMATISK OPPRETTHOLDELSE AV BOREVAESKENIVAAET I ET BOREHULL,申请号NO19730000851-传众专利搜索

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发明名称	APPARAT FOR AUTOMATISK OPPRETTHOLDELSE AV BOREVAESKENIVAAET I ET BOREHULL
摘要
申请公布号	NO140021(C)	申请公布日期	1979.06.20
申请号	NO19730000851	申请日期	1973.03.02
申请人	DRESSER INDUSTRIES, INC.,	发明人	GRIFFIN, PHIL HARMON III,
分类号	E21B21/06;E21B21/08;(IPC1-7):E21B47/04;G05D9/00	主分类号	E21B21/06
代理机构		代理人
主权项
地址

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