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发明名称
Telephone system
摘要
申请公布号
US1855779(A)
申请公布日期
1932.04.26
申请号
US19300469530
申请日期
1930.07.21
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
THARP VICTOR S.
分类号
H04Q3/58
主分类号
H04Q3/58
代理机构
代理人
主权项
地址
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