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发明名称
Verfahren zur Aufweitung eines Durchgangs im Erdboden.
摘要
申请公布号
DE69005368(D1)
申请公布日期
1994.02.03
申请号
DE19906005368
申请日期
1990.06.19
申请人
CORSTJENS, HELENA MICHEL, MOL, BE
发明人
SMET, MARC JOZEF MARIA, B-2400 MOL, BE
分类号
E21B7/30;F16L55/165;(IPC1-7):F16L55/165
主分类号
E21B7/30
代理机构
代理人
主权项
地址
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