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发明名称
Restricted service telephone system
摘要
申请公布号
US2767249(A)
申请公布日期
1956.10.16
申请号
US19510237710
申请日期
1951.07.20
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
MACDONALD DUNCAN N.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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