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
Addiator ... I have one, from Professor Adolf D. May, Jr. | Old calculator, Slide rule, Pocket calculators
Addiator hi-res stock photography and images - Alamy
Addiator Mechanical Calculator - Free photo on Pixabay - Pixabay