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发明名称
Removable letter sign
摘要
申请公布号
US2538056(A)
申请公布日期
1951.01.16
申请号
US19480020670
申请日期
1948.04.13
申请人
STAAF WERNER I
发明人
STAAF WERNER I.
分类号
G09F7/08
主分类号
G09F7/08
代理机构
代理人
主权项
地址
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