HAUPPAUGE, N.Y., Oct. 5 -- Spellman High Voltage Electronics Corp., a maker of high-voltage power supplies, DC-DC converters and power systems for medical and industrial applications, semiconductor manufacturing, scientific instrumentation, telecommunications, x-ray and automatic test equipment, has purchased the assets of Valhalla, N.Y.-based Del High Voltage Corp., formerly a division of Del Global Technologies Corp. The acquisition includes Del High's customers, product lines, technology and personnel. 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