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发明名称
Intercommunication systems
摘要
申请公布号
US2766327(A)
申请公布日期
1956.10.09
申请号
US19510217922
申请日期
1951.03.28
申请人
INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION
发明人
LESTI ARNOLD
分类号
H04Q11/04
主分类号
H04Q11/04
代理机构
代理人
主权项
地址
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