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发明名称
Audio amplification system
摘要
申请公布号
US1876675(A)
申请公布日期
1932.09.13
申请号
US19290378058
申请日期
1929.07.13
申请人
HILER EDWARD E
发明人
HILER EDWARD E.
分类号
H03F3/28;H03F3/32
主分类号
H03F3/28
代理机构
代理人
主权项
地址
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