Double wheel belt grinder. By Lewis Razors. 5:15 video:
It appears to just be two motors driving the wheels separately. There is an adjuster to slide the wheels closer together or apart. Cannot be sure but there appears to be a threaded rod behind the wheels. The rod appears to move when he turned the adjuster at around 2:40, but it is not clear enough to see for sure. That could have been in my imagination.
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