31 DAIRY PRODUCTS PROCESSING MACHINERY AND EQUIPMENT-NAMELY, COOLERS, INDUSTRIAL REFRIGERANT COMPRESSORS AND PARTS THEREFOR, REFRIGERANT VALVES AND FITTINGS FOR SUCH EQUIPMENT, MILK FILTERS, MILK STRAINERS, ICE CREAM FREEZERS, TRAYS AND FORMS USED IN ICE CREAM-MAKING PLANTS AND REFRIGERANT CONTROLS