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经营范围
发明名称
Improvements in electric sound reproducers
摘要
申请公布号
GB439170(A)
申请公布日期
1935.11.26
申请号
GB19340015736
申请日期
1934.05.26
申请人
FRANCIS ROCK CARLING
发明人
分类号
H04R9/06
主分类号
H04R9/06
代理机构
代理人
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