282217 Pneumatic and other continuous action elevators and conveyors, for goods or materials

28221740 Pneumatic elevators and conveyors 28221750 Bucket type continuous-action elevators and conveyors for goods or materials 28221770 Belt type continuous-action elevators and conveyors for goods or materials 28221793 Roller conveyors for goods or materials (excluding pneumatic elevators and conveyors, those specially designed for use underground, bucket type, belt type) 28221795 Continuous-action elevators or conveyors for goods or materials (excluding pneumatic elevators or conveyors, those designed for use underground, bucket type, belt type, roller conveyors)