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Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, air-conditioning, ventilating, heat recovery, air filtering and water supply as well as sanitary equipment; air filters, parts and components of the said apparatus and equipments. Building construction, including installation of apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, air conditioning, ventilating, heat recovery, air filtering and water supply as well as sanitary equipment; repair of apparatus for lighting, steam generating, cooking, refrigerating, drying, air- conditioning, ventilating, heat recovery, air filtering and water supply as well as sanitary equipment, air filters as well as parts and components of said apparatus and equipment. Customized production of apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, air-conditioning, ventilating, heat recovery, air filtering and water supply as well as sanitary equipment. Administration, control and granting of license rights; building and construction planning and consulting; services of engineers; issuing of technical expert opinions; technical advice and expert activity; design, development, planning, projecting and construction (engineer services) of industry and machine plants, apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, air conditioning, ventilating, heat recovery, air filtering and water supply as well as sanitary equipment, air filters; material testing; services of a research and development office; design of new products; design of data programs for others; all the aforementioned services for others.