farm machine parts, namely, poly closing wheels, rolling cultivator shields, row crop disc shields, disc scrapers, harrow adjusters, closing wheel arms, seed drum row shut offs, sliding planter lids, skid shoes, swather shoes, cotton picker skid shoes, chain tighteners, moldboard covers, ridge till moldboards, shank protectors, sugar beet scalpers, stalk stompers, poly shank protectors, swather and haybine poly wear shoes