Addiators
These small,flat calculators have a long history.
The Frenchman Caze(1720) and the Russian Kummer (1874)build the first calculators based on this principle.
In 1888 J.L.Troncet (France) produced commercial the Arithmographe. That's the reason why they give this kind of calculators the name troncets.
These troncets are produced in several coutries (Germany, USA, Japan, etc) until the introduction of the electronic pocket-calculator.
