11 apparatus for lighting, heating, steam generating, cooking, refrigerating, drying and ventilating water supply and sanitary purposes, namely electric lights, gas and electric water boilers, mash and brew kettles, heat accumulators, heat exchangers, coolers, chillers, refrigerators and ventilating ducts and louvers, ventilating fans for commercial and industrial use, pumbling fittings and interconnections, namely valves, cocks, bibbs, unions, tees, joints, elbows, escutcheons and traps; milk collection installations comprised of refrigerated milk cooling tanks, and pasteurizers; sanitary installations, namely automatic drawing systems for holding tanks, piping and integrated food installations; and cryogenic freezing boxes and tunnels, and parts and connections therefor