Portable rig, mast and substructure,申请号US19590840962-传众专利搜索

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发明名称	Portable rig, mast and substructure
摘要
申请公布号	US3033527(A)	申请公布日期	1962.05.08
申请号	US19590840962	申请日期	1959.09.18
申请人	HART WILSON JOHN	发明人	WILSON JOHN HART
分类号	E21B15/00	主分类号	E21B15/00
代理机构		代理人
主权项
地址

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