Odhner Arithmometer pinwheel calculator - video
Odhner Arithmometer pinwheel calculator. Around $200-$700 on eBay, depending on condition.
<video controls autoplay loop>
<source src="https://s3-us-west-1.amazonaws.com/hmt-forum/odhner_pinwheel_calculator.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
Previously:
https://www.homemadetools.net/forum/...896#post108875
https://www.homemadetools.net/forum/...6452#post83701
More: https://en.wikipedia.org/wiki/Odhner_Arithmometer