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发明名称
Dynamic loud-speaker
摘要
申请公布号
US1757386(A)
申请公布日期
1930.05.06
申请号
US19290343942
申请日期
1929.03.02
申请人
THE UTAH RADIO PRODUCTS COMPANY
发明人
PREATOR FREDERICK;SEELY DON R.
分类号
H04R9/04
主分类号
H04R9/04
代理机构
代理人
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地址
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