Uploaded December 2022 | Updated September 2026, 3 hours ago

---

The Odhner H11C7 is a hand-driven adding listing machine. It was made in Sweden from the late 1950s to the early 1970s.

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

0:00 Intro
0:31 Addition
1:03 (Sub)totals
1:48 Subtraction
2:28 Negative totals
3:02 Multiplication
3:58 Clearing input
4:25 Register capacity
4:51 Ink ribbon and paper
5:42 Vibration damping
6:53 History
7:35 Outro