Power tongs and control system therefor,申请号US19500191702-传众专利搜索

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发明名称	Power tongs and control system therefor
摘要
申请公布号	US2741460(A)	申请公布日期	1956.04.10
申请号	US19500191702	申请日期	1950.10.23
申请人	HILLMAN-KELLEY	发明人	GARDNER ROBERT I.
分类号	E21B19/16	主分类号	E21B19/16
代理机构		代理人
主权项
地址

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