71425034
Nov 1, 1939
Mar 26, 1940
METALS AND ALLOYS THEREOF ADAPTED TO MAKE METAL WORKING AND CUTTING TOOLS, AND TO MAKE WEAR-RESISTING SURFACES, HAVING PARTICULAR REFERENCE TO REFRACTORY METALS SUCH AS TANTALUM, COLUMBIUM, MOLYBDENUM, OR TUNGSTEN, AND ALLOYS THEREOF
Jewelry