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经营范围
发明名称
Improvements in electrical sound recording and reproducing apparatus
摘要
申请公布号
GB686777(A)
申请公布日期
1953.01.28
申请号
GB19500003526
申请日期
1950.02.11
申请人
ADRIAN FRANCIS SYKES
发明人
分类号
H04R17/04
主分类号
H04R17/04
代理机构
代理人
主权项
地址
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