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发明名称
Loud-speaking telephone receiver
摘要
申请公布号
US1753812(A)
申请公布日期
1930.04.08
申请号
US19220572730
申请日期
1922.07.03
申请人
ALEXANDER THOMAS ADOLPH
发明人
THOMAS ADOLPH ALEXANDER
分类号
H04R11/00
主分类号
H04R11/00
代理机构
代理人
主权项
地址
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