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发明名称
Four-wire terminal transmission control
摘要
申请公布号
US1986516(A)
申请公布日期
1935.01.01
申请号
US19310567327
申请日期
1931.10.06
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
MITCHELL DOREN
分类号
H04B3/20
主分类号
H04B3/20
代理机构
代理人
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