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发明名称
Improvements in sound amplifying apparatus and systems
摘要
申请公布号
GB333312(A)
申请公布日期
1930.08.14
申请号
GB19290015318
申请日期
1929.05.16
申请人
GRAHAM AMPLION LIMITED;CHARLES FRANCIS PHILLIPS
发明人
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
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地址
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