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发明名称
Improvements in methods of gramophone reproduction
摘要
申请公布号
GB328317(A)
申请公布日期
1930.04.22
申请号
GB19290001975
申请日期
1929.01.21
申请人
WILLIAM EWART WILLIAMS
发明人
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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