Computers and measuring apparatus, including apparatus for measuring the dimensional accuracy of a sheet metal workpiece; computers for automatically controlling machine tools; and computers for controlling the programs of such computers; parts and accessories for the foregoing in this class

Self-contained hole-punching, notching and nibbling units used in perforating, notching and nibbling metal sheets and other sheet materials; punch presses and other machines used in blanking, perforating, notching and nibbling metal sheets and other sheet materials; machines for punching, notching and nibbling sheet metal; metal drilling and layout machines; parts and workpiece locating and gauging devices for the said machines, liquid springs; spring mountings for dies and punches for presses; screw feeders; punch-type machines for assembling and staking nuts in sheet metal; work holders for gluing, soldering, welding and similar operations all the aforesaid goods being machines or parts of machines