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发明名称
Down-the-hole drill
摘要
申请公布号
AU656445(B2)
申请公布日期
1995.02.02
申请号
AU19920030203
申请日期
1992.12.17
申请人
UNIROC AB
发明人
BERNDT EKWALL;TORBJORN JAKOBSSON;MARTIN PETERSON
分类号
E21B4/14;(IPC1-7):E21B4/14;E21B10/38
主分类号
E21B4/14
代理机构
代理人
主权项
地址
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