Feed control device for drilling rig drums,申请号US19610116911-传众专利搜索

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发明名称	Feed control device for drilling rig drums
摘要
申请公布号	US3033530(A)	申请公布日期	1962.05.08
申请号	US19610116911	申请日期	1961.05.22
申请人	HART WILSON JOHN	发明人	WILSON JOHN HART
分类号	E21B19/08	主分类号	E21B19/08
代理机构		代理人
主权项
地址

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