BOREHOLES BROACHING BIT,申请号PL19830244174-传众专利搜索

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发明名称	BOREHOLES BROACHING BIT
摘要
申请公布号	PL140784(B1)	申请公布日期	1987.05.30
申请号	PL19830244174	申请日期	1983.10.15
申请人		发明人
分类号	E21B;E21B10/08;E21B10/26;(IPC1-7):E21B10/26	主分类号	E21B
代理机构		代理人
主权项
地址

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