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发明名称
Electronic private branch exchange
摘要
申请公布号
US3221108(A)
申请公布日期
1965.11.30
申请号
US19620230588
申请日期
1962.10.15
申请人
INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION
发明人
SEEMANN DONALD F.;DUPUIS JOHN J.;CHEN GORDON K. C.
分类号
H04Q3/00;H04Q3/52
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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