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发明名称
Telephone system
摘要
申请公布号
US2277441(A)
申请公布日期
1942.03.24
申请号
US19400344039
申请日期
1940.07.05
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
KOECHLING CHARLES D.
分类号
H04Q3/62
主分类号
H04Q3/62
代理机构
代理人
主权项
地址
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