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发明名称
Telephone system
摘要
申请公布号
US2224517(A)
申请公布日期
1940.12.10
申请号
US19390269161
申请日期
1939.04.21
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
KESSLER FRANK
分类号
H04Q3/00;H04Q5/06
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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