SINGLE-SPINDLE DRILLING MACHINES, MULTIPLE-SPINDLE DRILLING MACHINES, ADJUSTABLE-SPINDLE DRILLING MACHINES, HIGH-DUTY DRILLING MACHINES, INDEPENDENT-FEED DRILLING MACHINES, GANG DRILLING MACHINES, WAY DRILLING MACHINES, INVERTED DRILLING MACHINES, BOILER-SHELL DRILLS, WAY TAPPING MACHINES, WAY REAMING MACHINES, PISTON-TURNING MACHINES, CONTINUOUS TURNING MACHINES, CYLINDER-BORING MACHINES, CYLINDER-REAMING MACHINES, VALVE-BORING MACHINES, VALVE-GRINDING MACHINES, MUD-RING AND FLUE-SHEET DRILLS