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发明名称
INTERSECTION SOLUTION METHOD FOR DRILL BIT DESIGN
摘要
申请公布号
GB9102674(D0)
申请公布日期
1991.03.27
申请号
GB19910002674
申请日期
1991.02.07
申请人
DRESSER INDUSTRIES, INC.
发明人
分类号
E21B10/42;E21B10/43;E21B10/46;E21B10/56;E21B10/567
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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