Stress relief groove for drill pipe,申请号GB19940018623-传众专利搜索

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发明名称	Stress relief groove for drill pipe
摘要
申请公布号	GB9418623(D0)	申请公布日期	1994.11.02
申请号	GB19940018623	申请日期	1994.09.15
申请人	PRIDECO INC	发明人
分类号	E21B17/00;B21D51/16;E21B17/04;E21B17/042;F16L13/02;F16L13/04	主分类号	E21B17/00
代理机构		代理人
主权项
地址

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