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发明名称
Telephone system
摘要
申请公布号
US2214809(A)
申请公布日期
1940.09.17
申请号
US19390291483
申请日期
1939.08.23
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
CAVERLY HARRY C.
分类号
H04M3/12;H04M15/10
主分类号
H04M3/12
代理机构
代理人
主权项
地址
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