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经营范围
发明名称
Improvements in and relating to loudspeakers
摘要
申请公布号
GB509428(A)
申请公布日期
1939.07.14
申请号
GB19380001364
申请日期
1938.01.14
申请人
HORACE BALFOUR DAVEY
发明人
分类号
H04R1/34
主分类号
H04R1/34
代理机构
代理人
主权项
地址
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