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发明名称
Communication systems
摘要
申请公布号
GB1126286(A)
申请公布日期
1968.09.05
申请号
GB19670003386
申请日期
1967.01.23
申请人
GORDON A. FRIESEN INTERNATIONAL, INC.
发明人
分类号
G08B3/10;H04M9/00;H04M11/02;H04N7/18
主分类号
G08B3/10
代理机构
代理人
主权项
地址
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