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发明名称
Apparatus for audible signboard advertising
摘要
申请公布号
US1810264(A)
申请公布日期
1931.06.16
申请号
US19280316842
申请日期
1928.11.02
申请人
BONITZ FRED W
发明人
BONITZ FRED W.
分类号
G09F25/00
主分类号
G09F25/00
代理机构
代理人
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