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发明名称
Interchangeable unit luminous gaseous sign
摘要
申请公布号
US2245681(A)
申请公布日期
1941.06.17
申请号
US19380212416
申请日期
1938.06.08
申请人
KENIGSBERG ALEXANDER H
发明人
KENIGSBERG ALEXANDER H.
分类号
G09F13/26
主分类号
G09F13/26
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代理人
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