By A Mystery Man Writer
Addiators, or troncets, are simple adding or adding/subtracting devices which operate via a system of slides usually operated with a stylus. They are also commonly known as slide adders. Addiators are strictly speaking just one of many brands of slide adder, but the term "Addiator" has been adopted as the generic term for all such…
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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
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