# Firestone XR-9

> 1940s American experimental helicopter

**Wikidata**: [Q3205510](https://www.wikidata.org/wiki/Q3205510)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Firestone_XR-9)  
**Source**: https://4ort.xyz/entity/firestone-xr-9


## References

1. BabelNet