76415360
May 29, 2002
Oct 21, 2003
POWER OPERATED ROTARY EARTH BORING DRILL BITS FEATURING TUNGSTEN CARBIDE INSERT CUTTING ELEMENTS, TUNGSTEN CARBIDE AND HARDMETAL/HARD MATERIAL WEAR PROTECTION, AND USING OPEN, AIR-COOLED OR SEALED, ROLLER-OR-FRICTION-TYPE BEARING SYSTEMS
Machinery