# Jan van Koningsveld

> German mental calculator

**Wikidata**: [Q104149](https://www.wikidata.org/wiki/Q104149)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Jan_van_Koningsveld)  
**Source**: https://4ort.xyz/entity/jan-van-koningsveld


## References

1. Integrated Authority File