11 gas, electric and steam-operated cooking and heating equipment, namely, ovens and microwave ovens for cooking; steam kettles, convection steamers and pressure steamers for cooking; refrigerators, freezers, walk-in coolers and freezers, refrigerators for keeping blood, vaccines, nursery milk and other products at temperatures above and below freezing; ice flakers; water coolers; and cook-chill catering apparatus, namely, blast coolers and electric rethermalization ovens