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发明名称
BORRHUVUD
摘要
申请公布号
SE7808585(A)
申请公布日期
1979.04.29
申请号
SE19780008585
申请日期
1978.08.11
申请人
* SMITH INTERNATIONAL INC
发明人
L L * GARNER;G R * HERRICK;C R * HARRIS
分类号
E21B10/52;(IPC1-7):E21B9/10
主分类号
E21B10/52
代理机构
代理人
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