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发明名称
Improvements in or relating to sound transducing apparatus
摘要
申请公布号
GB821580(A)
申请公布日期
1959.10.07
申请号
GB19570012123
申请日期
1957.04.13
申请人
ELECTRIC & MUSICAL INDUSTRIES LIMITED
发明人
CHALLIS WILLIAM SIDNEY;PATTERSON ROBERT ALAN;RAE ALEXANDER JAMES
分类号
G11B21/12
主分类号
G11B21/12
代理机构
代理人
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地址
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