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经营范围
发明名称
Speech transmission system
摘要
申请公布号
US2282464(A)
申请公布日期
1942.05.12
申请号
US19410380446
申请日期
1941.02.25
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
EDWARDS PAUL G.;TAYLOR EDMUND R.
分类号
H04B3/42;H04M7/08
主分类号
H04B3/42
代理机构
代理人
主权项
地址
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