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INTEGRATED ELECTRONIC DEVICES, NAMELY FUZZY SET COMPARATORS, FUZZY DATA CORRELATORS, NEUTRAL NETWORKS, FAST RAMP GENERATORS, VOLTAGE CONTROLLED ONE-SHOT CIRCUITS, FREQUENCY-TO-VOLTAGE CONVERTERS, TIME-TO-VOLTAGE CONVERTERS, FAST TRACK AND HOLD AMPLIFIERS; AND DEVICE TESTING SYSTEMS COMPRISING PROBES, PROBE CONTROL CIRCUITS, A DATA PROCCESSOR AND A POWER SUPPLY