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发明名称
Loud-speaker
摘要
申请公布号
US1773605(A)
申请公布日期
1930.08.19
申请号
US19270192256
申请日期
1927.05.18
申请人
WILFRED SEFTON;PENNINGTON SEFTON
发明人
SEFTON WILFRED;SEFTON PENNINGTON
分类号
H04R1/24
主分类号
H04R1/24
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代理人
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