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经营范围
发明名称
BORKRONER.
摘要
申请公布号
NO912154(D0)
申请公布日期
1991.06.05
申请号
NO19910002154
申请日期
1991.06.05
申请人
DRESSER INDUSTRIES INC
发明人
KING, WILLIAM W.;SAWYER, GEORGE STOKELY
分类号
E21B10/42;E21B10/43;E21B10/60;(IPC1-7):E21B/
主分类号
E21B10/42
代理机构
代理人
主权项
地址
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