A DOWEL DEVICE FOR CONNECTING ROTARY-DRILL CASINGS,申请号GB19930015246-传众专利搜索

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发明名称	A DOWEL DEVICE FOR CONNECTING ROTARY-DRILL CASINGS
摘要
申请公布号	GB9315246(D0)	申请公布日期	1993.09.08
申请号	GB19930015246	申请日期	1993.07.23
申请人	GLADSTONE JOHN N.	发明人
分类号	E21B17/046;E21B17/08;F16L37/14	主分类号	E21B17/046
代理机构		代理人
主权项
地址

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