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发明名称
Improvements in and relating to sound-producing devices
摘要
申请公布号
GB486379(A)
申请公布日期
1938.06.02
申请号
GB19370024889
申请日期
1937.09.13
申请人
THE BRITISH THOMSON-HOUSTON COMPANY, LIMITED
发明人
分类号
G10K5/00
主分类号
G10K5/00
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代理人
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