Scientific, Electrical, and Electronic Apparatus and Instruments for Control, Measuring and Monitoring-Namely, Circuitry, Electronic Logic Circuits, Relay Circuits, Logic Control Circuits, and Analog and Digital Circuitry; Logic Modules; Detectors; Connectors; Transducers; Conditioners; Amplifiers; Isolators; Controllers; Measuring Elements; Timers; Alarms; Annunciators; Alarm Annunciators; Converters; Frequency Converters; Indicators; Inverters; Computers; Micro-Computers; Computation Instru...