Collapsible oil well derrick,申请号US19570636380-传众专利搜索

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发明名称	Collapsible oil well derrick
摘要
申请公布号	US2857993(A)	申请公布日期	1958.10.28
申请号	US19570636380	申请日期	1957.01.25
申请人	HOMER TERRELL	发明人	TERRELL HOMER
分类号	E04H12/18;E21B15/00	主分类号	E04H12/18
代理机构		代理人
主权项
地址

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