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发明名称
Echo suppressor
摘要
申请公布号
US1951465(A)
申请公布日期
1934.03.20
申请号
US19300476422
申请日期
1930.08.19
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
WRIGHT SUMNER B.;MITCHELL DOREN
分类号
H04B3/20
主分类号
H04B3/20
代理机构
代理人
主权项
地址
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