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发明名称
Фотоэлектрическое устройство для ориентировки слепых
摘要
申请公布号
SU71223(A2)
申请公布日期
1947.11.30
申请号
SU19470355270
申请日期
1947.04.14
申请人
PESIN I.B.
发明人
PESIN I.B.
分类号
G09B21/00
主分类号
G09B21/00
代理机构
代理人
主权项
地址
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