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  Copy of RIMG0049_cra.jpg - All pictures show the naked machine. The mechanism was the brainchild of Natale Cappelaro and Marcello Nizzoli designed the form. About 6 million Tetractys calculators were built between 1956 and ~1975.  
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All pictures show the naked machine. The mechanism was the brainchild of Natale Cappelaro and Marcello Nizzoli designed the form. About 6 million Tetractys calculators were built between 1956 and ~1975. Download
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