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经营范围
发明名称
Speaking clock arrangement
摘要
申请公布号
GB2059121(A)
申请公布日期
1981.04.15
申请号
GB19800029543
申请日期
1980.09.12
申请人
GEC US
发明人
分类号
G04G13/00;(IPC1-7):G04C21/14
主分类号
G04G13/00
代理机构
代理人
主权项
地址
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