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发明名称
摘要
申请公布号
FR2278909(B3)
申请公布日期
1978.10.06
申请号
FR19750011638
申请日期
1975.04.15
申请人
RUHRKOHLE AG
发明人
分类号
E21C35/08;(IPC1-7):E21C35/24
主分类号
E21C35/08
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