Uploaded December 2022 | Updated September 2026, 2 hours ago

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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:
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