This section shows stamps depicting mainframes computers. A mainframe is a powerful, large and very expensive computer, used mainly by government institutions, universities, big companies for large-scale computing purposes. The term mainframe indicates also the early computers of 1940's and 1950's such as the Zuse Z3, Atanosoff-Berry Computer (ABC), Colossus, Harvard Mark I, ENIAC, UNIVAC, EDVAC and others.
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