Some type of tooling set up. Looks like a deburring tool and a cutting bar. I’ve seen similar set ups for lathes, but this looks different. Possibly the item that looks like a cutting bar is actually an indexing stop.
A chainsaw sharpener clamps on the drive teeth, which are about 1/16". The clamp lever in the pic is also adjustable. I have a modern one with that same setup except mine has a grinding wheel.
A chainsaw sharpener clamps on the drive teeth, which are about 1/16". The clamp lever in the pic is also adjustable. I have a modern one with that same setup except mine has a grinding wheel.