Conveying machinery; conveying machinery components, namely, roller elements for conveyor belts, roller conveyor belts and chain conveyor belts, namely, machine components and structural parts containing rolls for roller conveyors and for conveyor belts and for drives for conveyor installations, in the nature of rolls, rollers, roller bearings and roller conveyors; conveying machinery components, namely, deflection elements and deflection devices for conveyor belts and chain conveyor belts, n...