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经营范围
发明名称
BORKRONE.
摘要
申请公布号
NO791605(A)
申请公布日期
1980.01.25
申请号
NO19790001605
申请日期
1979.05.14
申请人
DRESSER INDUSTRIES, INC.,
发明人
PHELPS, FRANCIS EUGENE,
分类号
E21B10/08;E21B10/22;E21B10/25;(IPC1-7):E21B/
主分类号
E21B10/08
代理机构
代理人
主权项
地址
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