Suanpan — Chinese Traditional Calculating Tools
thingiverse
Suanpan, a traditional calculating tool from China's Northern Song Dynasty, has been recognized as an intangible cultural heritage. This ancient instrument is distinct from the soroban, and for more information on its history and significance, one can refer to * [Suanpan](https://en.wikipedia.org/wiki/Suanpan) [Soroban](https://en.wikipedia.org/wiki/Soroban) *. The OpenSCD code for this model is available at https://github.com/ZhangGaoxing/openscad-models/tree/master/Suanpan. A visual representation of the suanpan's decimal system can be seen in the image below... 
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