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经营范围
发明名称
ERDBOHRER
摘要
申请公布号
DE3014188(A1)
申请公布日期
1980.12.11
申请号
DE19803014188
申请日期
1980.04.14
申请人
HUGHES TOOL CO.
发明人
OTTO PESSIER,RUDOLPH CARL
分类号
E21B7/28;E21B10/10;E21B10/12;E21B10/16;E21B10/22;E21B10/25;E21B10/34;E21B10/52;E21D3/00;(IPC1-7):E21B10/26
主分类号
E21B7/28
代理机构
代理人
主权项
地址
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