7
air cooled condensers
11
Plants for heating, steam generating, refrigerating, cooling, drying, ventilating, water supply and sanitary purposes; water cooling towers; heat exchangers not part of machines; environmental control apparatus, namely, water cooled surface condensers; feedwater heaters, heat regenerators; parts and fittings for the aforesaid goods
37
Building construction; building repair; installation of plants for heating, steam generating, refrigerating, cooling, drying, ventilating, water supply and sanitary purposes; installation of apparatus for heating, steam generating, refrigerating, cooling, drying, ventilating, water supply and sanitary purposes, namely, air cooled condesers; installation of water cooling towers, heat exchangers not part of machines and environmental control apparatus in the nature of water cooled surface condensers; installation of feedwater heaters and heat regenerators; construction, repair, installation and maintenance of cooling towers
42
Scientific and industrial research; technological consultancy; design services in the field of water cooling towers
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