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发明名称
Telephone system
摘要
申请公布号
US2274760(A)
申请公布日期
1942.03.03
申请号
US19390282007
申请日期
1939.06.30
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
WICKS JOHN
分类号
H04M3/54
主分类号
H04M3/54
代理机构
代理人
主权项
地址
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