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发明名称
Changeable sign
摘要
申请公布号
US1912540(A)
申请公布日期
1933.06.06
申请号
US19320599122
申请日期
1932.03.16
申请人
FRANK J. JONTZEN
发明人
PAZOUREK LOUIS;KERCKHOFF KARL L.
分类号
G09F7/00
主分类号
G09F7/00
代理机构
代理人
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