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发明名称
Signal controlled switching circuits in telephone systems
摘要
申请公布号
US2212960(A)
申请公布日期
1940.08.27
申请号
US19390283926
申请日期
1939.07.12
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
SCHOTT LIONEL
分类号
H04B3/20;H04M3/40
主分类号
H04B3/20
代理机构
代理人
主权项
地址
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