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- 70620A Agilent PreamplifierCondition: UsedFrequency: 22 Hz
- 70621A Agilent PreamplifierCondition: UsedFrequency: 2.9 Hz
- 8447B Agilent PreamplifierCondition: UsedFrequency: 1.3 Hz
- 85905A Agilent PreamplifierCondition: UsedFrequency: 1 Hz
- 888 Amplifier Research PreamplifierCondition: UsedFrequency: 1 GHz
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- 9200A Tabor PreamplifierCondition: UsedFrequency: 500 kHz