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发明名称
Portable power megaphone apparatus
摘要
申请公布号
US2915587(A)
申请公布日期
1959.12.01
申请号
US19530399665
申请日期
1953.12.22
申请人
HARDESTY FREDERICK L
发明人
HARDESTY FREDERICK L.
分类号
H04R27/04
主分类号
H04R27/04
代理机构
代理人
主权项
地址
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