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发明名称
Improvements relating to electro-acoustic apparatus
摘要
申请公布号
GB741333(A)
申请公布日期
1955.11.30
申请号
GB19530014944
申请日期
1953.05.29
申请人
FERRANTI LIMITED
发明人
WILLIAMSON DAVID THEODORE NELSON
分类号
H03G3/34
主分类号
H03G3/34
代理机构
代理人
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地址
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