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We have a F.P.Rosback foot powered perforator with fixed punches. The back of the machine indicates that it is a No. 6 Special Model Adjustable Multiplex Punching Machine. We are trying to find more information about this machine but don’t know how to start. From what I can tell it was built when the company moved to Benton Harbor [MI] as it has the city name on the back of the face of the machine. Can you help me understand where to start to find more information?