EROSION RESISTANT ROCK DRILL BIT,申请号AU19870073491-传众专利搜索

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发明名称	EROSION RESISTANT ROCK DRILL BIT
摘要
申请公布号	AU607421(B2)	申请公布日期	1991.03.07
申请号	AU19870073491	申请日期	1987.05.28
申请人	INGERSOLL-RAND COMPANY	发明人	JOSEPH R. DITZIG
分类号	E21B10/38;E21B10/56;(IPC1-7):E21B10/56	主分类号	E21B10/38
代理机构		代理人
主权项
地址

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