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发明名称
Perfectionnements aux appareils d'enseignement
摘要
申请公布号
FR705108(A)
申请公布日期
1931.06.01
申请号
FRD705108
申请日期
1930.11.04
申请人
发明人
AMOR MANUEL ANTUNES
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
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