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发明名称
Telephone system
摘要
申请公布号
US1840376(A)
申请公布日期
1932.01.12
申请号
US19300448495
申请日期
1930.04.30
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
WHITNEY WILEY
分类号
H04M5/08
主分类号
H04M5/08
代理机构
代理人
主权项
地址
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