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发明名称
DISPLAY DEVICE WITH REVERSIBLE AND REPLACEABLE FOUR-MESSAGE DISPLAY CARTRIDGE
摘要
申请公布号
CA880999(A)
申请公布日期
1971.09.14
申请号
CAD880999
申请日期
申请人
NATIONAL ADVERTISING COMPANY
发明人
ROBERT K. RUTCHICK
分类号
主分类号
代理机构
代理人
主权项
地址
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