Geraet zur UEberwachung von Bohrloechern,申请号DE1941S003383D-传众专利搜索

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发明名称	Geraet zur UEberwachung von Bohrloechern
摘要
申请公布号	DE857934(C)	申请公布日期	1952.12.04
申请号	DE1941S003383D	申请日期	1941.01.14
申请人	SPERRY-SUN WELL SURVEYING COMPANY	发明人	RING ROLAND
分类号	E21B47/022	主分类号	E21B47/022
代理机构		代理人
主权项
地址

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