23 MATERIAL HANDLING CONVEYORS, INCLUDING PORTABLE ADJUSTABLE BELT BOOSTER CONVEYORS, WIRE MESH BELT CONVEYORS, STATIONARY CONVEYORS, PORTABLE CONVEYORS, CHAIN CONVEYORS, RAIL CONVEYORS, ROLLER CONVEYORS, CURVED LINE CONVEYORS, STRAIGHT LINE CONVEYORS, INCLINED CONVEYORS, CONVEYOR SECTIONS, AND SPIRAL CONVEYORS