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发明名称
Sound reproducing instrument
摘要
申请公布号
US1833789(A)
申请公布日期
1931.11.24
申请号
US19290352305
申请日期
1929.04.03
申请人
MITCHELL THEODORE R
发明人
MITCHELL THEODORE R.
分类号
G11B3/60
主分类号
G11B3/60
代理机构
代理人
主权项
地址
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