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发明名称
Undervisningsapparat bestående af en billedprojektor og en dermed sammenkoblet lydgengiver.
摘要
申请公布号
DK100396(C)
申请公布日期
1964.11.23
申请号
DK19570001018
申请日期
1957.03.20
申请人
EDUARD RITTER
发明人
EDUARD RITTER
分类号
G09B;(IPC1-7):G09B
主分类号
G09B
代理机构
代理人
主权项
地址
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