Qualitron Universal Conversion Calculator 1975 Model 1438 *missing Battery Lid CD Trying to pin down this

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Qualitron Universal Conversion Calculator 1975 Model 1438 *missing Battery Lid CD Trying to pin down thisQualitron Universal Conversion Calculator Vintage Model 1438. In working order. Functions: ASMD, conversion factors Technology: MOS LSI (Rockwell A4004PC) Display: 8 digits, vacuum fluorescent module Dimensions: 75W x 145D x 35H, weight 250g. Manufactured: Qualitron, Taiwan, 1975 The Qualitron 1438 is a basic four function calculator with a range of pre programmed conversion factors for distance, mass, volume, and temperature. Two slider switches