parts of machines and installations for protection against wear, in the nature of industrial processing machine, conveyor and mixer machine parts for bunkers, silos, pipelines, conveyor chutes and channels, mixers and other storage, conveying and processing equipment and installations for pourable or conveyable materials in bulk, namely, plates in the nature of metal plates, screen plates, panels, plankings, and slabs, castings moulds, hollow parts in the nature of tubes, piping components in...