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Recently, micro computers have been used as sequence controllers of machine tools. As much effort was needed to complete designing and producing the sequence controllers, some errors were inevitable. In order to alleviate his problem, an automatic design and production system using computers is needed. A newly developed computer aided design and production system for sequence controllers of machine tools is described in the report. The system has the following features: The system can keep and refer the sequence circuit diagram using large scale magnetic discs and magnetic tapes. The system is a man-machine communication system with graphic display and character display. It is possible to design, modify, refer, compare and link the sequence circuits diagram using the system. The system has a plotter terminal which is used to draw the sequence circuit diagram. The system can write out the object program of sequence circuits into ROM using ROM writers.