DRILL PIPE STRING VIBRATION DAMPER,申请号PL19870266574-传众专利搜索

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发明名称	DRILL PIPE STRING VIBRATION DAMPER
摘要
申请公布号	PL155235(B1)	申请公布日期	1991.10.31
申请号	PL19870266574	申请日期	1987.06.30
申请人		发明人
分类号	E21B;E21B17/04;(IPC1-7):E21B17/04	主分类号	E21B
代理机构		代理人
主权项
地址

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