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发明名称
Changeable sign
摘要
申请公布号
US1847069(A)
申请公布日期
1932.03.01
申请号
US19310538337
申请日期
1931.05.18
申请人
CORRIGAN WILLIAM J
发明人
CORRIGAN WILLIAM J.
分类号
G09F11/00
主分类号
G09F11/00
代理机构
代理人
主权项
地址
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