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发明名称
Sound-reproducing machine
摘要
申请公布号
US1768200(A)
申请公布日期
1930.06.24
申请号
US19270225407
申请日期
1927.10.11
申请人
MICHAEL HOFFMAN
发明人
HOFFMAN MICHAEL
分类号
G11B25/02
主分类号
G11B25/02
代理机构
代理人
主权项
地址
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