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发明名称
Lehrmittelgerät
摘要
申请公布号
CH453768(A)
申请公布日期
1968.03.31
申请号
CH19670011116
申请日期
1967.08.06
申请人
KRETH,HERMANN;WILLING,FRANK
发明人
KRETH,HERMANN;WILLING,FRANK
分类号
G09B3/04
主分类号
G09B3/04
代理机构
代理人
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