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经营范围
发明名称
BORKRONE.
摘要
申请公布号
NO783957(A)
申请公布日期
1979.06.08
申请号
NO19780003957
申请日期
1978.11.23
申请人
DRESSER INDUSTRIES, INC.,
发明人
MITCHELL, HOWARD EARL,
分类号
E21B10/16;E21B10/52;(IPC1-7):E21B/
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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