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经营范围
发明名称
Diamond drag bit for soft formations
摘要
申请公布号
US4981184(A)
申请公布日期
1991.01.01
申请号
US19880274169
申请日期
1988.11.21
申请人
SMITH INTERNATIONAL, INC.
发明人
KNOWLTON, R. HELENE;AZAR, MICHAEL G.
分类号
E21B10/16;E21B10/18;E21B10/56;E21B10/567;E21B10/60
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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