11 Concentrators, distillers, evaporators, reactors, crystallizers, heat exchangers, coolers, heaters and degassers, all for use in chemical processing; concentrators, distillers, evaporators, reactors, crystallizers, heat exchangers, coolers, heaters and degassers, all for use in food and beverage processing; concentrators, distillers, evaporators, reactors, crystallizers, heat exchangers, coolers, heaters and degassers, all for use in preparation of a resin composition and recovery of etching solutions; crystallizers for producing pharmaceuticals; milk sterilizers; drying apparatus, namely, drying machines equipped with one or more of the following -- concentrators, agitators, distillers, evaporators, heat exchangers, coolers, heaters and degassers for use in production of chemicals, pharmaceuticals and foods; steamers for use in chemical processing; recuperators for use in chemical processing; evaporators for use in chemical processing; distillation apparatus, namely, distillers for use in distillation of chemicals and liquor; heat exchangers; and water purifying apparatus and machines, namely, water purification units and water purification units for sewage