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发明名称
Improvements in or relating to sound magnifying devices
摘要
申请公布号
GB383324(A)
申请公布日期
1932.11.17
申请号
GB19310022734
申请日期
1931.08.11
申请人
PHILIP CHRISTIAN CRONACHER;JOHN HENRY ERBES
发明人
分类号
H04R1/30
主分类号
H04R1/30
代理机构
代理人
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地址
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