# Th.D. Jansen

> Dutch scientific instrument maker (1855–1940)

**Wikidata**: [Q65961244](https://www.wikidata.org/wiki/Q65961244)  
**Source**: https://4ort.xyz/entity/th-d-jansen


## References

1. [Source](https://hdl.handle.net/21.12102/F90540CC7F1B47239B63911F90FC045E)
2. [Source](https://historischcentrumoverijssel.nl/archieven/?mivast=20&mizig=236&miadt=141&miaet=54&micode=0123.3184&minr=5071540&miview=ldt)
3. [Source](http://www.dwc.knaw.nl/biografie/scientific-instrument-makers/?pagetype=authorDetail&aId=PE00012203)