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发明名称
Прибор для обучения по методу вопросов и ответов
摘要
申请公布号
SU41251(A1)
申请公布日期
1935.01.31
申请号
SU19340146865
申请日期
1934.05.04
申请人
BUTKEVICH G.A.
发明人
BUTKEVICH G.A.
分类号
G09B3/06
主分类号
G09B3/06
代理机构
代理人
主权项
地址
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