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发明名称
Telephone system
摘要
申请公布号
US2186317(A)
申请公布日期
1940.01.09
申请号
US19380198223
申请日期
1938.03.26
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
BEALE CHARLES EDMUND;RICHARDS IDRIS TREVOR
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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地址
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