EXTENSION RODS USED IN PERCUSSIVE DRILLING,申请号US19760663266-传众专利搜索

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发明名称	EXTENSION RODS USED IN PERCUSSIVE DRILLING
摘要
申请公布号	US4051906(A)	申请公布日期	1977.10.04
申请号	US19760663266	申请日期	1976.03.03
申请人	TRW CANADA LIMITED	发明人	DONEGAN, EDWARD ALFRED
分类号	E21B17/042;(IPC1-7):B25D9/00	主分类号	E21B17/042
代理机构		代理人
主权项
地址

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