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发明名称
METHOD OF DRILLING A BORE HOLE
摘要
申请公布号
CA2621438(A1)
申请公布日期
2003.02.01
申请号
CA20022621438
申请日期
2002.07.31
申请人
SMITH INTERNATIONAL, INC.
发明人
ROCK, DOUGLAS LAWRENCE
分类号
E21B43/25;E21B7/00;E21B10/00;E21B49/00
主分类号
E21B43/25
代理机构
代理人
主权项
地址
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