Biogrind, often associated with Rexworks and CMI, offered a good horizontal grinder design. Some of the smallest Biogrind horizontals could process slab wood. Not an easy accomplishment! Their ram fed grinders were known for their design and reliability. We have a few resources for this equipment if you ever get stuck.
Owned it for 20 years. Bought a bigger grinder. Grinds well. Newer rebuild on Kraft clutch. Some holders on the mill need replaced. We may do it but you can buy it a little cheaper now! Other than mill work, it’s in pretty decent condition. More info to come.