11 Apparatus for heating, heat recovering, cooling, refrigeration, ventilation, boiling, cooking, steam generation, concentration, drying, pasteurization, distillation, sterilization, disinfection and desalination, namely, plate heat exchangers, spiral heat exchangers, shell and tube heat exchangers, air cooling heat exchangers as well as other types of heat exchangers; filters, namely membrane filters for use in the purification of liquids and the concentration and separation of pharmaceuticals, dairy products, antibiotics, enzymes, dextrans, pyrogens, yeast extracts, food gums, beer, juice, wine, eggs, sugar, animal blood plasma, gelatine, vinegar, and soy isolate in the food, dairy, beverage, brewery, sugar, starch, vegetable oil, biochemical, pharmaceutical, chemical, marine, mining, oil and gas, engineering, hvac, refrigeration, power generation, steelworks, water and waste water treatment industries; parts, components and spare parts for the aforesaid goods