Well drilling rig,申请号GB19470018001-传众专利搜索

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发明名称	Well drilling rig
摘要
申请公布号	GB635149(A)	申请公布日期	1950.04.05
申请号	GB19470018001	申请日期	1947.07.08
申请人	JAMES WILL MENHALL	发明人
分类号	E21B3/02	主分类号	E21B3/02
代理机构		代理人
主权项
地址

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