Telescopic derrick and locking means therefor,申请号US19540405218-传众专利搜索

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发明名称	Telescopic derrick and locking means therefor
摘要
申请公布号	US2923381(A)	申请公布日期	1960.02.02
申请号	US19540405218	申请日期	1954.01.20
申请人	CABOT SHOPS, INC.	发明人	WILKINSON ALVIN H.;NEWHOUSE WILLIAM G.
分类号	E04H12/34;E21B15/00	主分类号	E04H12/34
代理机构		代理人
主权项
地址

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