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发明名称
Telephone system
摘要
申请公布号
US2189994(A)
申请公布日期
1940.02.13
申请号
US19380209167
申请日期
1938.05.21
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
REIER GEORGE C.
分类号
H04M3/56
主分类号
H04M3/56
代理机构
代理人
主权项
地址
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