73603689
Jun 11, 1986
Aug 18, 1987
HARD METAL WEAR PARTS FOR OIL DRILLING TOOLS, NAMELY, DOWNHOLE OIL DRILLING BITS; HARD METAL DIES FOR FORMING SHEET METAL; HARD METAL MACHINE TOOL SLITTERS FOR STEEL SHEETS, HARD METAL RINGS FOR ROTARY PUMP SEALS, AND HARD METAL WEAR NOZZLES FOR SPRAYING ABRASIVE SLURRY
Machinery