Uploaded March 2025 | Updated September 2026, 45 minutes ago

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The Addiator company was founded in Germany in 1920, and immediately started producing these Addiators. The logo and design of mine was already in use in 1923, and produced until at least the 1930s, but I don't know when exactly mine was made. Various Addiator models were in production until the 1970s.

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

0:00 Introduction
0:45 Addition
2:40 Subtraction
3:39 Removal from case
4:58 History
5:19 Outro