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发明名称
Telephone system
摘要
申请公布号
US2291496(A)
申请公布日期
1942.07.28
申请号
US19400316748
申请日期
1940.02.01
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
NEWSTEDT HARRY N.
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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