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发明名称
Interchangeable sign
摘要
申请公布号
US2113285(A)
申请公布日期
1938.04.05
申请号
US19370173411
申请日期
1937.11.08
申请人
WAMSER CHARLES J
发明人
WAMSER CHARLES J.
分类号
G09F7/10
主分类号
G09F7/10
代理机构
代理人
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