Electric lowering arrangement for rotary deep drilling work,申请号GB19520032713-传众专利搜索

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发明名称	Electric lowering arrangement for rotary deep drilling work
摘要
申请公布号	GB736523(A)	申请公布日期	1955.09.07
申请号	GB19520032713	申请日期	1952.12.24
申请人	WERNER SCHULZE;ULRICH SCHWEDLER	发明人
分类号	E21B19/08;H02P7/08	主分类号	E21B19/08
代理机构		代理人
主权项
地址

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