Rotary machine drive for well servicing machines,申请号US19530342681-传众专利搜索

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发明名称	Rotary machine drive for well servicing machines
摘要
申请公布号	US2803973(A)	申请公布日期	1957.08.27
申请号	US19530342681	申请日期	1953.03.16
申请人	YOUNGSTOWN SHEET AND TUBE COMPANY	发明人	ASHTON ALBERT A.
分类号	B66D1/14;E21B3/06	主分类号	B66D1/14
代理机构		代理人
主权项
地址

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