Suction installations, in particular industrial vacuum cleaners, industrial suction units being suction pumps, hall ventilation installations being air suction machines; extraction arms being parts of machines; suction tables for industrial use for liquids; fume hoods being machine parts; accessories for suction installations, namely, suction nozzles for vacuum cleaners, suction pumps; system components for suction installations being machines, namely, pipe layers, ducted fans, hoses for vacu...