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File:Vintage Arithma Addiator Mechanical Handheld Calculator, Made In Germany, Variants Were Produced From 1920 - 1982, This Calculator Was A Promotional Item For Ser-Ap-Es (21295273712).jpg - Wikimedia Commons
MAXIMATOR - ANTIGUA CALCULADORA ADDIATOR DE LOS AÑOS 50 | Calculadora, Antigua, Antigüedades