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发明名称
ELECTRICAL VOICE TRANSMISSION NETWORK
摘要
申请公布号
CA317614(A)
申请公布日期
1931.12.01
申请号
CAD317614
申请日期
申请人
THE AUTOMATIC TELEPHONE MANUFACTURING COMPANY
发明人
TREVOR HUGH TURNEY
分类号
主分类号
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代理人
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