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发明名称
Two-way loud-speaker intercommunication system
摘要
申请公布号
US2545477(A)
申请公布日期
1951.03.20
申请号
US19480028446
申请日期
1948.05.21
申请人
JACQUES LEVY
发明人
LEVY JACQUES
分类号
H04M9/08
主分类号
H04M9/08
代理机构
代理人
主权项
地址
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