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发明名称
Sound reproduction
摘要
申请公布号
US1747261(A)
申请公布日期
1930.02.18
申请号
US19260129830
申请日期
1926.08.17
申请人
ARNOLD POULSEN;GEORG PETERSEN AXEL CARL
发明人
POULSEN ARNOLD;PETERSEN AXEL CARL GEORG
分类号
G11B7/28
主分类号
G11B7/28
代理机构
代理人
主权项
地址
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