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经营范围
发明名称
Sound amplifier
摘要
申请公布号
US1914783(A)
申请公布日期
1933.06.20
申请号
US19300429723
申请日期
1930.02.19
申请人
CHARLES MCLEAN
发明人
MCLEAN CHARLES
分类号
H04R1/42
主分类号
H04R1/42
代理机构
代理人
主权项
地址
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