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经营范围
发明名称
Improvements in talking machines
摘要
申请公布号
GB323779(A)
申请公布日期
1930.01.10
申请号
GB19280029142
申请日期
1928.10.10
申请人
WILLIAM FRANCIS COOPER
发明人
分类号
G11B25/02
主分类号
G11B25/02
代理机构
代理人
主权项
地址
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