FW

FLUID-HEATING APPARATUS-NAMELY, TUBULAR AIR HEATERS, GAS HEATERS, [ BLEEDER HEATERS, ] CHEMICAL HEATERS, OIL HEATERS [ TUBE SERVICE-WATER HEATER] , WATER BOILERS, AND WASTE-HEAT BOILERS AND HEAT-EXCHANGE APPARATUS-NAMELY, AFTERCOOLER, OIL COOLERS, VAPOR COOLERS, GAS COOLERS, [ DESUPER-HEATERS, EVAPORATOS DESUPER-HEATERS ] , AND NATURAL-GASOLINE-RECOVERY APPARATUS