PROCESS FOR REMOVING THE CORE OF EARTH FROM A PIPE LAID WITHOUT EXCAVATION AND SCRAPER FOR IMPLEMENTING SAID PROCESS,申请号EP19950909623-传众专利搜索

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发明名称	PROCESS FOR REMOVING THE CORE OF EARTH FROM A PIPE LAID WITHOUT EXCAVATION AND SCRAPER FOR IMPLEMENTING SAID PROCESS
摘要
申请公布号	EP0745175(A1)	申请公布日期	1996.12.04
申请号	EP19950909623	申请日期	1995.02.09
申请人	DERWAND, HORST	发明人	DERWAND, HORST
分类号	E21B7/04;B08B9/04;E21B4/18;E21B7/26;E21B37/04;E21D9/087;(IPC1-7):E21B7/00;E21B7/20	主分类号	E21B7/04
代理机构		代理人
主权项
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