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发明名称
DREDYING
摘要
申请公布号
GB2062727(B)
申请公布日期
1984.09.19
申请号
GB19800033805
申请日期
1980.10.20
申请人
PREUSSAG AG
发明人
分类号
E21C45/00;E02F3/88;E02F3/90;E02F3/92;E21C45/04;E21C50/00;E21C50/02;(IPC1-7):E02F3/88
主分类号
E21C45/00
代理机构
代理人
主权项
地址
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