71640558
Jan 9, 1953
Dec 28, 1954
POWDER METALLURGY COMPOSITIONS AND ALLOYS OF REFRACTORY METALS, PRECIOUS METALS AND METALLIC AND NONMETALLIC ELEMENTS AND COMPOUNDS CONTAINING TWO OR MORE OF THE FOLLOWING: TUNGSTEN, MOLYBDENUM, SILVER, COPPER, GOLD, PLATINUM, RUTHENIUM, IRIDIUM, PALLADIUM, COBALT, NICKEL, CADMIUM, GERMANIUM, IRON, CARBON OR TUNGSTEN CARBIDE
Jewelry