9 Measuring apparatus and instruments, namely, tool presetters and work presetters; remote maintenance system, namely, networked computers, computer software, video cameras, audio microphones, video monitors, and audio speakers for remote centralized monitoring and surveillance of machine tools and metalworking machines, with capability for electronically reporting monitoring and surveillance information to computers and personal digital assistants; machine tool monitoring system, namely networked computers, computer software, video cameras, audio microphones, video monitors, and audio speakers for collecting, storing and managing information from multiple numerically-controlled machine tools, and for electronically reporting machine output and operational status information to machine operators; electrical distribution or control machines and instruments, namely, programmable logic controllers and operation panels for machine tools; numerical control systems, namely, computers and computer software for programming and automatically controlling machine tools and metalworking machines; pre-recorded computer software for control, repair and maintenance of metal working machines and tools and their peripherals; pre-recorded computer operating programs; simulators for machine operation and control, electronic video monitors for displaying machine tool output information and machine tool operating status; and computers and user manual, and guides sold as a unit