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发明名称	KELLY BAR COUPLING
摘要
申请公布号	US3553980(A)	申请公布日期	1971.01.12
申请号	USD3553980	申请日期	1969.04.17
申请人	MOBILE DRILLING CO. INC.	发明人	ROBERT E. DICKINSON;WILLIAM P. HENSON
分类号	E21B17/04;F16D1/10;(IPC1-7):F16D1/10	主分类号	E21B17/04
代理机构		代理人
主权项
地址

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