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发明名称
DOWN-THE-HOLE DRILL
摘要
申请公布号
EP0003103(B2)
申请公布日期
1986.12.10
申请号
EP19790100010
申请日期
1979.01.02
申请人
BOART INTERNATIONAL LIMITED
发明人
MCENERY, JAMES OLIVER;MORTON, FRANK WILLIAM;O'DEA, JOHN JOSEPH
分类号
E21B10/38;(IPC1-7):E21B10/38;E21B4/14
主分类号
E21B10/38
代理机构
代理人
主权项
地址
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