Uploaded October 2020 | Updated September 2026, 2 hours ago

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This Rheinmetall calculator uses a stepped drum mechanism, and can do division fully automatically. Each stepped drum drives two register digits, so the digits are closer together than in many other stepped drum machines.

For more information about this and other calculators in my collection, please visit my website:
jaapsch.net/mechcalc

0:00 Introduction, History
2:18 Addition
3:03 Multiplication
3:59 Clearing
4:22 Subtraction
4:50 Division
7:42 Correction button
8:36 Further history
9:24 Outro