machines for mechanical purification of sewage, particularly fine rakes, fine sieves, sand traps, presses for rakings; fitted parts for the water-supply for equipping of shafts, elevated tanks and of installations for the treatment of water, particularly shaft covers, ventilating shafts, shaft ladders, doors, venetian blinds, input and removal pipes, fitting and extending parts, railings, platforms, landings, stairs, consoles; fitted parts and equipping parts for the field of waste disposal in the municipal as well as in the industrial sector, particularly for sewage plants, particularly channels, flaps, slides, rakes, cleaners of installations for holding back fat; equipping parts for passive protection of property, particularly doors, windows, venetian blinds, switchgear; fitted parts, particularly containers and weldments, for food processing factories, for bridge and road constructions as well as for filling stations and service areas, all goods mentioned before in essential parts of high-grade steel