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发明名称
摘要
申请公布号
SE318856(B)
申请公布日期
1969.12.22
申请号
SE19680013713
申请日期
1968.10.11
申请人
JOHANSSON T;JOHANSSON I
发明人
JOHANSSON T;JOHANSSON I
分类号
E21C49/04;(IPC1-7):E21C49/04
主分类号
E21C49/04
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