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发明名称
Elektronrørsforstærker, navnlig til tunghøreapparater.
摘要
申请公布号
DK74302(C)
申请公布日期
1952.06.16
申请号
DK19500000803
申请日期
1950.03.09
申请人
AMERICAN DANISH OTICON VED W. DEMANT
发明人
分类号
主分类号
代理机构
代理人
主权项
地址
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