Tungsten Carbide Tipped Rock Drill Bits

CIM Bulletin1951
THE greatest single advance in rock drilling practice since the advent of percussion drills was the introduction of tungsten carbide tipped rock drill bits.
Keywords: Bits, Canadian Ingersoll-Rand Company, drill bits, rock drill, steel, tungsten carbide, Drill, Drilling, Drills, Rock, Rocks, steel, Steels, Tungsten carbide
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