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https://www.antiguedades.es/en/sold-antique-calculators/4641-antique-vaucanson-ava13-calculating-machine-france-1930s.html Antique Vaucanson AVA13 Calculating Machine. France, 1930 Antique Vaucanson AVA13 calculator made in France in the 1930s, well preserved and in good working order for performing the four basic arithmetic operations. calculating machineantiquevaucansonfrance