Chuck mechanism for drill pipe,申请号US19560608013-传众专利搜索

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发明名称	Chuck mechanism for drill pipe
摘要
申请公布号	US2939197(A)	申请公布日期	1960.06.07
申请号	US19560608013	申请日期	1956.09.05
申请人	JOY MANUFACTURING COMPANY	发明人	LEVEN SAMUEL
分类号	B23B31/16;E21B19/08	主分类号	B23B31/16
代理机构		代理人
主权项
地址

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