The Bells came before the Silveys & Oregons and were a continuation of the Neilsen line of grinders I think? There was a whole series of them. This one doesn't have 10 degree tilt but many people don't use that anyway or they don't use chains with tilted top plates. These use a smaller wheel and a higher rpm motor. The wheels for these are still advertised for sale. This one will need a cord. It looks to be fabricated and if ever anything broke, you could probably make it or get it made locally.
This grinder was made for many years so you will see some variations in the motor used and various other changes as time went on. Also this may be a Neilson or a Bell brand depending on age?
4 X 3/8 X 3/16 wheel for 3/8 and 404 chain (R) FOR RESINOID
4 X 3/8 X 1/8 Wheel for 3/8 LP and .325 chain
These grinders were models K50, K100B, K150, KB1
This post is put here mainly for historical curosity as this grinder probably dates in the 70's? It is located near Lancaster, Pa $75
http://reading.craigslist.org/tls/3509088159.html