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发明名称
UNZERBRECHLICHE SCHREIBTAFEL MIT AUFGELEGTEM SCHIEFER.
摘要
申请公布号
DE1600641(U)
申请公布日期
1950.02.02
申请号
DE194900D1289U
申请日期
1949.02.05
申请人
FERDINAND GRAEF
发明人
FERDINAND GRAEF
分类号
主分类号
代理机构
代理人
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