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Experiment: Perrin tube (115 V, 50/60 Hz) - 8000663 - UE3070400-115 - Electron tubes - 3B Scientific
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Teltron Control Unit for Critical Potential Tubes (230 V, 50/60 Hz) - Teltron Electron Tubes - Teltron Vacuum Tubes - Cathode Ray Tube Experiment
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