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发明名称
HEARING AID TRANSISTOR AMPLIFIERS
摘要
申请公布号
CA610913(A)
申请公布日期
1960.12.20
申请号
CAD610913
申请日期
申请人
SONOTONE CORPORATION
发明人
FRANK A. HERRMANN
分类号
主分类号
代理机构
代理人
主权项
地址
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