# Harold Sellis Jefferies

> British mechanical engineer (1871-1917)

**Wikidata**: [Q63159368](https://www.wikidata.org/wiki/Q63159368)  
**Source**: https://4ort.xyz/entity/harold-sellis-jefferies


## References

1. Memoirs
2. [Source](http://www.gracesguide.co.uk/Harold_Sellis_Jefferies)