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发明名称
Telephone system
摘要
申请公布号
US1859385(A)
申请公布日期
1932.05.24
申请号
US19290382740
申请日期
1929.08.01
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
EDWARDS WILLIAM H.
分类号
H04M3/12
主分类号
H04M3/12
代理机构
代理人
主权项
地址
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