Conveyor Systems for Industrial and Agricultural Purposes-Namely, Pressurized Conveyors for Aggregates, Screw Conveyors, Vibrating Conveyors and Projection Conveyors; Agricultural Machines-Namely, Hay Distributors, Pre-Cleaners for Harvested Grain, Automatic Dump Boxes, Mechanical Feeders for Animals, and Machines for Loading and Unloading Aggregates from Ship and Land Vehicles; and Parts Thereof