11 Refrigerating machines, namely, centrifugal refrigerating machines, absorption refrigerating machines, chillers, heat pumps, fan coil units, cooling towers; plant equipment, namely, refuse pyrolysis gas recovery units, composting purification units, desulfurization units, dust collector units, deodorizing units, namely, machines for removing malodorous compounds, gas washers in the nature of wet gas cleaning units equipped with tiers of perforated plates for purifying noxious duct-containing gas, incinerators, refuse incinerators, sedimentation units, high speed filters not parts of machines, ION exchangers for deionizing water in the nuclear industry, night soil treating units, sugar making and refining unites, salt making and refining unites, concentrators, centrifugal dewatering units for sludge, steam generating installations; nuclear equipment, namely, condensate demineralizing units, radioactiveliquid wastes treatment units, namely, filters, demineralizers and evaporators, inbituming equipment for radioactive wastes, namely, asphalt solidification and bituminization equipment for radioactive wastes, radioactive off-gas treatment units, nuclear reactors and power plants and radioactive liquid wastes treatment plants; general industrial machines, namely, air and gas purifying and filtering units, industrial waste heat treating units; water and ornamental fountain units; treatment equipment for service water, sewage, industrial water and industrial waste water, night soil, refuse and industrial waste water treatment equipment, namely, water purifying plants, waste water treatment units, distilled water recovery units and processing units for industrial solid waste, processing units for domestic solid waste, refuse disposal units, refuse compressing unites; sewage soil crushing units; purification units for water; purification unites for sewage; nox and sox removable equipment, namely, units for removing nitrogen-oxide and sulfa-oxide in the air; and parts for the foregoing