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Dust collecting machines for chemical processing; Filters and purifiers for machines, namely, filters and purifiers for removing contaminants from gases used in the semiconductor industry; Gas diverters consisting of a pump, storage and refilling tank, pre-heater, vaporizer, recuperator, condenser and valves

Gas scrubbing apparatus; Fume extractors; Industrial air purifiers

Installation of utilities in construction sites; Installation of apparatus for supply and distribution of gas; Maintenance of building equipment; Repair of building equipment