AMPERKAT

chemical products used in industry, namely, crude and partially processed base metals cobalt, zinc, nickel, molybdenum, tungsten, rhenium, niobium and tantalum and their alloys and compounds for the production of catalysts

crude and partially processed base metals and their alloys and compounds, particularly the metals cobalt, zinc, nickel, molybdenum, tungsten, rhenium, niobium and tantalum and their alloys and compounds for the production of catalysts