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发明名称
Radio-tube-testing instrument
摘要
申请公布号
US1748847(A)
申请公布日期
1930.02.25
申请号
US19250020080
申请日期
1925.04.02
申请人
JEWELL ELECTRICAL INSTRUMENT COMPANY
发明人
MILLER JOHN H.
分类号
G01R31/25
主分类号
G01R31/25
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代理人
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