Interchangeable post construction for derricks,申请号US19290335540-传众专利搜索

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发明名称	Interchangeable post construction for derricks
摘要
申请公布号	US1789598(A)	申请公布日期	1931.01.20
申请号	US19290335540	申请日期	1929.01.28
申请人	EMSCO DERRICK & EQUIPMENT COMPANY	发明人	RAWSON LESLIE A.
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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