7 Parts for Conveyors and Vibrating Screens-Namely, Spiral and Disc Idlers, Belt Scrapers, Decks, Side Plates, Cross Members and Coverings for Idler Rolls, All Being Parts of Machines or for Use in Machines, All Utilizing a Polyurethane Formulation with High Impact and Abrasion Resistance Characteristics which Is Molded into or onto the Parts