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发明名称
ELEKTRONIK-LEHRSYSTEM
摘要
申请公布号
DE6920171(U)
申请公布日期
1969.11.27
申请号
DE19690020171U
申请日期
1969.05.08
申请人
PHYWE AG
发明人
分类号
主分类号
代理机构
代理人
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