I checked my own die filer, as it is a handy bench-top unit. The name on the crankcase cover-plate is: "Milwaukee Die Filer" and "Rice Pump and Machinery Company".
On the cast iron baseplate, the name "Milwaukee Chaplet Company" is cast in raised letters. A "chaplet" is used in foundry work to hold cores in position in molds, and is puddled into the casting. Interesting name on the baseplate, so the company which made my die filer must have gone thru a few incarnations.
The die filer which I have is about the size of a jig-saw. It is a handy machine for smaller work such as mechanism parts, and would be good sized machine for someone like a gunsmith.
The downside to the die filer which I have is its speed, even with the belt set on the slower speed steps of the pulleys (two speeds). I think a drive made from a DC treadmill motor with some kind of foot pedal controller would be ideal if I were having a lot of work for my die filer.
The complete unit, die filer, cast iron baseplate, motor and belt guard is something I can pick up and carry in my arms. There is an overarm support, if needed, but it swings out of the way and is easily removable. What my die filer lacks is a self-contained means of blowing the filings clear of the work, and a work light would be handy. I suppose a solenoid valve and regulator connected to shop air, with a flexible snout to direct the air to the filing area would be the way to make this happen. Start the filer motor, the compressed air to blow the filings clear comes on.
I keep my die filer on a stand with casters and brakes on them. This lets me roll the die filer out to a convenient location for either use or storing it. A shop stool of the right height is the other necessity with a die filer, in my opinion.