The Contex 30 calculator
The Contex 30 calculator as made by the Brothers Carlsen in Denmark from 1963 till 1971. It was a relatively cheap electric calculator with semi-automatic multiplication and division. For information on this and other calculators in my collection, please visit my website: https://www.jaapsch.net/mechcalc/ 0:00 Introduction 0:44 Addition 1:11 Subtraction 1:45 Clearing 2:08 Multiplication 3:09 Repeated multiplication 4:13 Problems 5:19 Division 8:12 Outro
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