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经营范围
发明名称
Sound amplifier
摘要
申请公布号
US1797528(A)
申请公布日期
1931.03.24
申请号
US19200430209
申请日期
1920.12.13
申请人
ALFRED LINTON CHESTER
发明人
LINTON CHESTER ALFRED
分类号
H04R1/20
主分类号
H04R1/20
代理机构
代理人
主权项
地址
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