Photo of an interesting interface for a card punch from late 60's early 1970's. These devices were sold by a company called RealTronics. Click image for more photos.
Cover removed. Note the large two-character Nixie tube display. Click image for more photos.
This control unit appears to be a current loop device, similar to a teletype. The RealTronics system consisted of a PDP 8i with third party hardware. I assume "Real" pertains to RealEstate, but I could only guess.