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发明名称
MULTIPLE ACCESS MESSAGE RETRIEVAL SYSTEM
摘要
申请公布号
GB1465874(A)
申请公布日期
1977.03.02
申请号
GB19760002904
申请日期
1975.05.05
申请人
EDUTRON INC
发明人
分类号
G09B5/12;G09B7/04;(IPC1-7):H04J15/00;G09B5/04;H04H1/00
主分类号
G09B5/12
代理机构
代理人
主权项
地址
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