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经营范围
发明名称
Improvements in and relating to gramophone horns
摘要
申请公布号
GB323874(A)
申请公布日期
1930.01.16
申请号
GB19280034871
申请日期
1928.11.27
申请人
JOHN WILSON
发明人
分类号
G10K13/00
主分类号
G10K13/00
代理机构
代理人
主权项
地址
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