K6

wear-resisting pieces consisting of cemented hard metallic compositions; namely, inserts to be used in dies and tools for working, cutting, or shaping metal and other materials, in lathe-centers, in bearing-surface and wearing-surface parts, in pump-valves and parts thereof, and for dies, cutting tools, lathe-centers, bearing-surface and wearing-surface parts, pump-valves which embody such wear-resisting pieces