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发明名称
Screen loud-speaker
摘要
申请公布号
US1778084(A)
申请公布日期
1930.10.14
申请号
US19280308523
申请日期
1928.09.26
申请人
NEVIN JAMES V
发明人
NEVIN JAMES V.
分类号
G03B21/56;H04R7/04
主分类号
G03B21/56
代理机构
代理人
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地址
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