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发明名称
Changeable indicia display device
摘要
申请公布号
US2974433(A)
申请公布日期
1961.03.14
申请号
US19580748441
申请日期
1958.07.14
申请人
LITZINGER DENNIS P
发明人
LITZINGER DENNIS P.
分类号
G09B17/00
主分类号
G09B17/00
代理机构
代理人
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