Plates of metal, namely, steel plates as elements for screening, crushing and conveying machines for minerals; linings of metal, namely, sheet metal and steel plates used as elements for screening, crushing and conveying machines for minerals; bars of metal, namely, hollow and solid steel bars for use as elements for screening, crushing and conveying machines for minerals; cones of metal, namely, cone-shaped steel blocks for use as elements for screening, crushing and conveying machines for m...