73265220
Jun 6, 1980
Sep 15, 1981
Drilling and Cutting Tools and Equipment-Namely, Drill Bits, Core Bits, Core Barrels, Reamers, Washover Shoes, Drill Collars, Stabilizers, Jarring Tools, Shock Absorbers, and in Hole Motors, Used in Mining, Well Drilling and Coring Operations
Machinery