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发明名称
Telephone system
摘要
申请公布号
US2213511(A)
申请公布日期
1940.09.03
申请号
US19390302090
申请日期
1939.10.31
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BENNETT WILLIAM
分类号
H04M3/487;H04M3/523
主分类号
H04M3/487
代理机构
代理人
主权项
地址
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