HOLROYD

MACHINE TOOLS FOR THE MANUFACTURE OF HELICAL SCREW FORMS AND OF HELICAL SCREW ROTORS FOR COMPRESSORS, PUMPS OR GEARS; MACHINE TOOLS FOR THE PROFILE GRINDING OF CUTTERS FOR USE IN THE MANUFACTURE OF HELICAL SCREW FORMS; HELICAL SCREW ROTORS BEING PARTS OF COMPRESSORS, PUMPS OR GEARS, AND OPTICAL FORM GAUGING