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发明名称
Double signal system
摘要
申请公布号
US2287816(A)
申请公布日期
1942.06.30
申请号
US19380218795
申请日期
1938.07.12
申请人
AMERICAN DISTRICT TELEGRAPH COMPANY
发明人
MUEHTER MANFRED W.
分类号
G07C1/20
主分类号
G07C1/20
代理机构
代理人
主权项
地址
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