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经营范围
发明名称
Telephone echo suppressor
摘要
申请公布号
US1821928(A)
申请公布日期
1931.09.08
申请号
US19280301867
申请日期
1928.08.24
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
CLARK ALVA B.
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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