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发明名称
Signal system
摘要
申请公布号
US1908254(A)
申请公布日期
1933.05.09
申请号
US19290394074
申请日期
1929.09.20
申请人
GENERAL ELECTRIC COMPANY
发明人
KAAR IRA J.
分类号
H04L27/04
主分类号
H04L27/04
代理机构
代理人
主权项
地址
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