WARM-O-TRAY electric food keeper tile

Still in its original box, this is an electric warming plate meant to sit on a countertop or buffet table to keep food warm for serving. Made by Atlantic Precision Works of New York NY, their model #30T. Its heating surface is a decorated ceramic material with a signature (c) Salvatore Puglisi. This is a smallish unit, meant to hold something like a coffee pot or single dish.