SURFACE HARDENING OF DRILL ROD COUPLINGS,申请号GB19850021740-传众专利搜索

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发明名称	SURFACE HARDENING OF DRILL ROD COUPLINGS
摘要
申请公布号	GB8521740(D0)	申请公布日期	1985.10.09
申请号	GB19850021740	申请日期	1985.09.02
申请人	SAIPEM SPA	发明人
分类号	E21B17/00;C21D1/09;C21D9/00;C21D9/14;C21D9/22;(IPC1-7):C21D9/00	主分类号	E21B17/00
代理机构		代理人
主权项
地址

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