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发明名称
Changeable letter sign
摘要
申请公布号
US1797322(A)
申请公布日期
1931.03.24
申请号
US19290388839
申请日期
1929.08.27
申请人
CALLENDER STEPHEN J
发明人
CALLENDER STEPHEN J.
分类号
G09F7/06
主分类号
G09F7/06
代理机构
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