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发明名称
VISUAL AID DEVICE
摘要
申请公布号
US3611599(A)
申请公布日期
1971.10.12
申请号
USD3611599
申请日期
1969.08.15
申请人
DIETER BAARS
发明人
DIETER BAARS
分类号
G09B29/08;(IPC1-7):G09F9/46
主分类号
G09B29/08
代理机构
代理人
主权项
地址
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