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发明名称
Telephone system
摘要
申请公布号
US2218571(A)
申请公布日期
1940.10.22
申请号
US19370134991
申请日期
1937.04.05
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
BEALE CHARLES EDMUND
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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