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发明名称
Electric selective signaling system
摘要
申请公布号
US2454967(A)
申请公布日期
1948.11.30
申请号
US19470720841
申请日期
1947.01.08
申请人
RICHARD FROST LESLIE
发明人
FROST LESLIE RICHARD
分类号
H04L19/00
主分类号
H04L19/00
代理机构
代理人
主权项
地址
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