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发明名称
Telephone system
摘要
申请公布号
US2037221(A)
申请公布日期
1936.04.14
申请号
US19320607814
申请日期
1932.04.27
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
EVERS HARRY G.
分类号
H04Q3/58
主分类号
H04Q3/58
代理机构
代理人
主权项
地址
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