# Seibel S-4

> 1949 helicopter series by Seibel Helicopter

**Wikidata**: [Q3280831](https://www.wikidata.org/wiki/Q3280831)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Seibel_S-4)  
**Source**: https://4ort.xyz/entity/seibel-s-4


## References

1. U.S. Army Aircraft Since 1947