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发明名称
VORRICHTUNG ZUM BESEITIGEN VON UNREGELMAESSIGKEITEN IN ODER ZUR ERWEITERUNG VON UNTERGRUNDROHREN.
摘要
申请公布号
DE3776686(D1)
申请公布日期
1992.03.26
申请号
DE19873776686
申请日期
1987.05.15
申请人
CLEARLINE SERVICES LTD
发明人
YARNELL ROLAND
分类号
E21B10/32;E21B;E21B7/20;E21B7/26;E21B7/28;E21B7/30;E21B29/10;F16L55/165;F16L55/18;(IPC1-7):E21B7/26
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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