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发明名称
Telephone system
摘要
申请公布号
US1848399(A)
申请公布日期
1932.03.08
申请号
US19300433872
申请日期
1930.03.07
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
TURNEY TREVOR HUGH
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
主权项
地址
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