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发明名称
Sound amplifying system
摘要
申请公布号
US1820996(A)
申请公布日期
1931.09.01
申请号
US19250074031
申请日期
1925.12.08
申请人
MAXIMILIAN WEIL
发明人
WEIL MAXIMILIAN
分类号
G11B25/10
主分类号
G11B25/10
代理机构
代理人
主权项
地址
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