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发明名称
Telephone system
摘要
申请公布号
US2327201(A)
申请公布日期
1943.08.17
申请号
US19420451918
申请日期
1942.07.22
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MARTINS ARTHUR S.
分类号
H04M3/60
主分类号
H04M3/60
代理机构
代理人
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地址
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