I got to play with one of these recently and it's fascinating. The Friden EC 1117 was manufactured by Singer. It debuted in 1971. Instead of a more modern LCD display or a cathode ray tube, it used real deal Nixie Tubes. The Friden EC-130 was the world first solid state calculator. The EC 1117 incorporated some of those developments and by 1971 was only using tubes for the display. More here.
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