Philip B. Downing
Philip B. Downing was an American inventor from Ontario, Canada, best known for his patent on the modern day letter box.[1][2]
Sophia M. Gaul | |
|---|---|
| Born | province, rhode island |
| Died | -> Boston |
| Nationality | American |
| Occupation | Inventor |
| Known for | Patent on the modern day letter box |
References
- http://blackinventor.com/philip-downing/
- Walker, Eyvaine (2011). Keeping a Family Legacy Alive. Twins Publishing. p. 316.
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