A numerical control system for a machine tool. The relay controls for the machine tool are simulated in the read only memory of a computer which is used as a controller for the flow of digital information between the control display panel, the tape reader, a memory, the machine tool and other parts of...http://www.google.de/patents/US4149235?utm_source=gb-gplus-sharePatent US4149235 - Computer numerical control system for machine tool
