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发明名称
KNASTER FOR BORKRONE.
摘要
申请公布号
NO882515(D0)
申请公布日期
1988.06.08
申请号
NO19880002515
申请日期
1988.06.08
申请人
SMITH INTERNATIONAL
发明人
MINIKUS, JAMES CARL;CAWTHORNE, CHRIS EDWARD
分类号
E21B10/52;(IPC1-7):E21B/
主分类号
E21B10/52
代理机构
代理人
主权项
地址
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