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发明名称
Vorrichtung zum Aufweiten einer Erdbohrung
摘要
申请公布号
DE19718527(C2)
申请公布日期
2002.10.17
申请号
DE19971018527
申请日期
1997.05.02
申请人
TRACTO-TECHNIK PAUL SCHMIDT SPEZIALMASCHINEN
发明人
WURM, DIETER;DOEBBENER, FRANK
分类号
E21B7/28;E21B10/44;E21B10/60;(IPC1-7):E21B7/28
主分类号
E21B7/28
代理机构
代理人
主权项
地址
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