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发明名称
PUNKT-RECHENSCHIEBER FUER DIE ERSTE VOLKSSCHULKLASSE.
摘要
申请公布号
DE1640187(U)
申请公布日期
1952.06.26
申请号
DE195200K7636U
申请日期
1952.02.21
申请人
HANS KREIL
发明人
HANS KREIL
分类号
主分类号
代理机构
代理人
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