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发明名称
Orientierungshilfe fuer Blinde
摘要
申请公布号
DE717223(C)
申请公布日期
1942.02.09
申请号
DE1940U015177D
申请日期
1940.09.24
申请人
GREGOR UKOVIC
发明人
UKOVIC GREGOR
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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