Automatic floor scrubbers; Automotive exhaust pipe; Catalytic converter units for vehicle exhausts; Dust exhausting installations for cleaning purposes; Engine exhaust systems comprised of pipes, collector and muffler; Exhaust gas treatment systems for diesel engines; Exhaust manifold for engines; Exhaust mufflers for motors; Exhaust pipes for land vehicles; Exhaust silencers for engines; Exhaust system temperature, pressure and flow sensors being parts of internal combustion engines; Exhausts for motors and engines; Floor scrubbing machines; Mounting brackets adapted for exhaust systems for internal combustion engines; Silencers as part of vehicle exhaust systems