The ANITA Mk 7 was the first commercial electronic desktop calculator, as well as the first desktop unit using "tubes" or "valves." More specifically, trigger tubes and dekatrons which, by the way, are amazing to watch with the case open while they are "ring counting" during a computation. Imagine blinking Christmas tree lights on steroids. [EXPLORE MoTET's ANITA Photo Gallery]

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The miniaturization that led to the ANITA Mk 7 was made possible through the progressive miniaturization of the tubes themselves. Unfortunately, heat dissipation issues became an early roadblock to continued miniaturization using this technology. This was solved in rather spectacular fashion with the switching to transistors - no pun intended. The use and availability of solid state technology allowed for an explosion in miniaturization, by way of  optical stepping and integrated circuit technology. This miniaturization "explosion" ultimately led to the modern personal computer.   

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Note: The ANITA Mk 8 was not far behind, chronologically, and is a near tie with the ANITA Mk 7.

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For the most comprehensive website on ANITA calculators,

kindly explore vintagecalculators.com