Fo my FERO Air Pump's 75th birthday it got new wires, belts, a new GULF decal, and a paint job. Mechanically it still runs perfectly, loading and unloading, start at 80 and cut out at 125.
I've had this 30 years and when I got it back then I painted it and I could see that earlier paint jobs covered up a GULF sticker.
Arnie Fero's web site aboce says FEROs were made from 1900 to the late 1930s and had a contract to supply compressors for GULF. Guards over belts were not an issue back in those days.