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发明名称
Loud-speaker
摘要
申请公布号
US1748996(A)
申请公布日期
1930.03.04
申请号
US19260107046
申请日期
1926.05.06
申请人
REICHMANN FRANK J
发明人
REICHMANN FRANK J.
分类号
H04R7/12
主分类号
H04R7/12
代理机构
代理人
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地址
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