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发明名称
Stecktafel fuer den Unterricht
摘要
申请公布号
DE846027(C)
申请公布日期
1952.08.07
申请号
DE1950B008769
申请日期
1950.08.13
申请人
BAUERSCHMIDT JOHANN
发明人
BAUERSCHMIDT JOHANN
分类号
G09B1/10
主分类号
G09B1/10
代理机构
代理人
主权项
地址
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