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发明名称
Noise reduction in telephone transmission systems
摘要
申请公布号
US2321986(A)
申请公布日期
1943.06.15
申请号
US19420433772
申请日期
1942.03.07
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BROWN JOHN T. L.
分类号
H04B1/64;H04B3/06
主分类号
H04B1/64
代理机构
代理人
主权项
地址
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