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发明名称
REVERSIBLE CONCEALED IMAGE DEVICE AND METHOD OF USE
摘要
申请公布号
US3508344(A)
申请公布日期
1970.04.28
申请号
USD3508344
申请日期
1967.07.17
申请人
A.B. DICK CO.
发明人
RICHARD E. THOMAS
分类号
G09B3/04;(IPC1-7):G09B3/00
主分类号
G09B3/04
代理机构
代理人
主权项
地址
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