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发明名称
Switching apparatus for electric signs
摘要
申请公布号
US1840299(A)
申请公布日期
1932.01.12
申请号
US19290403498
申请日期
1929.10.30
申请人
ANTIPOVITCH BORIS M
发明人
ANTIPOVITCH BORIS M.
分类号
G09G3/00
主分类号
G09G3/00
代理机构
代理人
主权项
地址
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