Back pressure valves as parts of machines; Car washing installations; Compressors for machines; Dust exhausting installations for cleaning purposes; Dust removing installations for cleaning purposes; Electric machines and apparatus for carpet shampooing; Electric wax-polishing machines for industrial purposes; Filters for motors and engines; Machine parts, namely, nozzles which are parts of power-operated sprayers; Pumps as parts of machines, motors and engines; Self-propelled road sweeping machines; Spraying machines; Starters for motors and engines; Steam engines; Wet-cleaning washing machines; Dredging machines