How do you find information on a gun company in the 1950s called Prize Machine Gun?

I found this. "PRIZE MACHINE GUN and PRIZE MACHINE GUN CO. were made by Simonis, Janssen & Dumoulin who was located in Leige,Belgium from 1873 to 1914."

"The name MACHINE GUN has nothing to do with a rapid fire repeating gun. It means the gun was made on machinery as opposed to being hand made and fitted."