73172518
May 23, 1978
Jul 21, 1981
Common, Raw and Semi-Worked Metals and Their Alloys; Steel, Special Metals and Natural Alloys in the Form of Sheet Metal, Wire, Tubes, Bars and Forged Pieces
Metal GoodsThermal, Mechanical, Chemical and Other Treatments of Metals, for the Purpose of Modifying the Mechanical Characteristics and Surface States of Metals and Alloys
Treatment of Materials