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发明名称
Improvements in or relating to the reproduction of sound by electro-acoustical devices
摘要
申请公布号
GB507238(A)
申请公布日期
1939.06.13
申请号
GB19370027368
申请日期
1938.10.10
申请人
FREDERICK EDWARD LEACH;HUGH BICKET
发明人
分类号
H04R1/24
主分类号
H04R1/24
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代理人
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