Annunciator system apparatus for indicating the conditions of process and other variables, including alarm lights, plug-in relay units, pre-wired chassis units, control switches, and cabinets for housing the same; self-policing annunciator systems and parts therefor; annunciator equipment for indicating the on, off and defective operating conditions of electric motors; electrical annunciator instruments and component parts thereof, such as multiple relay plug-in containers; panel boards with integrated diagrams and/or recording and/or indicating instruments, such as thermometers, pressure gauges, potentiometers and the like, and component parts thereof; electric and/or electronic supervisory control systems, sequence or selective process scanning systems, monitoring systems for automatically determining and/or recording physical data such as temperatures and presence and location Of electric short circuits; co-ordinated control and/or recording panels containing recording elements and/or gauges and/or control elements; automatic process measuring and recording equipment; instrumentation for process control equipment in conventional and nuclear power plants, in oil refineries, in paper mills, in metal working industries, in food and chemical processing; digital computer and data handling systems for industrial and commercial applications; and hospital data information systems, comprising data preparation means, data sending means, data storage means and data readout means