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发明名称
DRILL BIT
摘要
申请公布号
GB2088443(A)
申请公布日期
1982.06.09
申请号
GB19810035650
申请日期
1981.11.26
申请人
CHRISTENSEN INC
发明人
分类号
E21B10/00;E21B10/02;E21B10/04;E21B10/44;E21B10/54;E21B10/56;E21B10/567;E21B10/60
主分类号
E21B10/00
代理机构
代理人
主权项
地址
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