Drilling rig and method of extending an upper section of the mast thereof,申请号US19560625119-传众专利搜索

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发明名称	Drilling rig and method of extending an upper section of the mast thereof
摘要
申请公布号	US2991852(A)	申请公布日期	1961.07.11
申请号	US19560625119	申请日期	1956.11.29
申请人	C. N. HOUSH	发明人	LEE HAROLD D.
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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