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发明名称
Telephone system
摘要
申请公布号
US2233282(A)
申请公布日期
1941.02.25
申请号
US19390290366
申请日期
1939.08.16
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BUCHANAN RUSSELL B.;KOECHLING CHARLES D.
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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