Sumlock ANITA calculator

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The British designed-and-built ANITA Mark VII calculator, first manufactured by Bell Punch/Sumlock Comptometer in 1961, was the world's first all-electronic desktop calculator. It used vacuum tubes in its circuits and cold-cathode nixie tubes for its display.

The acronym 'Anita' was formed from ' A New Introduction To Arithmetic", and not, as rumoured at the time, to be the name of the designers wife.

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