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经营范围
发明名称
Improvements relating to sound reproduction
摘要
申请公布号
GB671056(A)
申请公布日期
1952.04.30
申请号
GB19490016683
申请日期
1949.06.23
申请人
FIELDEN (ELECTRONICS) LIMITED;JOHN ERNEST FIELDEN;JEFFREY CHARLES EVANS
发明人
分类号
G11B9/00
主分类号
G11B9/00
代理机构
代理人
主权项
地址
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