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发明名称
LEHRTAFEL, INSBESONDERE FUER SCHULEN, ZUR DARSTELLUNG VON STRASSENVERKEHRSVORGAENGEN.
摘要
申请公布号
DE1632433(U)
申请公布日期
1951.12.20
申请号
DE195100P2403U
申请日期
1951.08.31
申请人
FA. HANS PICKARDT
发明人
分类号
主分类号
代理机构
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