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经营范围
发明名称
Improvements in or relating to sound records
摘要
申请公布号
GB346458(A)
申请公布日期
1931.04.16
申请号
GB19280037459
申请日期
1929.10.21
申请人
SHERARD OSBORN COWPER-COLES
发明人
分类号
G11B3/70
主分类号
G11B3/70
代理机构
代理人
主权项
地址
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