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发明名称
MODELLIERTAFEL MIT MAGNETISCHEN MODELLBAUSTEINEN ZUM UEBEN VON MAUERVERBAENDEN.
摘要
申请公布号
DE1653798(U)
申请公布日期
1953.04.09
申请号
DE195300K0677U
申请日期
1953.01.16
申请人
WILHELM KOEHNKE
发明人
WILHELM KOEHNKE
分类号
主分类号
代理机构
代理人
主权项
地址
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