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经营范围
发明名称
ANORDNING VED DRILLBOR.
摘要
申请公布号
NO801095(A)
申请公布日期
1980.12.01
申请号
NO19800001095
申请日期
1980.04.16
申请人
HUGHES TOOL CO,
发明人
PESSIER, RUDOLF CARL OTTO,
分类号
E21B7/28;E21B10/10;E21B10/12;E21B10/16;E21B10/22;E21B10/25;E21B10/34;E21B10/52;E21D3/00
主分类号
E21B7/28
代理机构
代理人
主权项
地址
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