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Since 1958 Thermionics has designed, developed, and manufactured ultra high vacuum (UHV) equipment for scientific and industrial applications. Our products are the result of careful research and development, rigorous testing, and continuing performance evaluation.Our product lines include:High Vacuum PumpsManipulators and Mechanical FeedthroughsVacuum Coating SystemsValvesFlanges and FittingsPyraFlat and TriMetal FlangesMechanical FeedthroughsElectrical FeedthroughsVacuum Pressure GaugesHelium Leak Detectors