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发明名称
Interchangeable letter sign
摘要
申请公布号
US2642686(A)
申请公布日期
1953.06.23
申请号
US19490087092
申请日期
1949.04.12
申请人
SIMPSON JACK W E
发明人
SIMPSON JACK W. E.
分类号
G09F7/02
主分类号
G09F7/02
代理机构
代理人
主权项
地址
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