# J. R. G. Isbrücker

> Dutch engineer and Esperantist (1889-1967)

**Wikidata**: [Q3808941](https://www.wikidata.org/wiki/Q3808941)  
**Source**: https://4ort.xyz/entity/j-r-g-isbr-cker


## References

1. Czech National Authority Database
2. Virtual International Authority File