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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
US3430372(A)
申请公布日期
1969.03.04
申请号
USD3430372
申请日期
1966.11.07
申请人
NATIONAL ADVERTISING CO.
发明人
ROBERT K. RUTCHICK
分类号
G09F11/02;(IPC1-7):G09F11/00
主分类号
G09F11/02
代理机构
代理人
主权项
地址
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