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发明名称
AUDION TUBE CIRCUIT TESTING APPARATUS
摘要
申请公布号
CA333777(A)
申请公布日期
1933.07.04
申请号
CAD333777
申请日期
申请人
THE JEWELL ELECTRICAL INSTRUMENT CO.
发明人
JOHN H. MILLER
分类号
主分类号
代理机构
代理人
主权项
地址
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