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发明名称
Sound reproducer
摘要
申请公布号
US1948361(A)
申请公布日期
1934.02.20
申请号
US19270209467
申请日期
1927.07.30
申请人
FEDERAL TELEGRAPH COMPANY
发明人
SOLLIE SIGURD A.
分类号
H04R9/02
主分类号
H04R9/02
代理机构
代理人
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