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发明名称
Toll ringing arrangements in telephone systems
摘要
申请公布号
US2871298(A)
申请公布日期
1959.01.27
申请号
US19560599402
申请日期
1956.07.23
申请人
INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION
发明人
HUTTON ROBERT W.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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