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发明名称
Taper bits.
摘要
申请公布号
ZA200003869(B)
申请公布日期
2001.02.12
申请号
ZA20000003869
申请日期
2000.07.31
申请人
GALISON DRILLING (PROPRIETARY) LIMITED
发明人
PETER REDVERS THORBURN
分类号
E21B;E21C
主分类号
E21B
代理机构
代理人
主权项
地址
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