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发明名称
Improvements in or relating to equipment for the reproduction of sound
摘要
申请公布号
GB346863(A)
申请公布日期
1931.04.23
申请号
GB19300002435
申请日期
1930.01.23
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
分类号
H03F3/02
主分类号
H03F3/02
代理机构
代理人
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