OEI

ELECTRICAL EQUIPMENT AND SOLID STATE ELECTRONIC DEVICES-NAMELY, OPERATIONAL AMPLIFIERS; VOLTAGE FOLLOWER, CURRENT BOOSTER; PREAMPLIFIERS; BIPOLAR LOGARITHMIC AMPLIFIERS; PHASE DETECTORS; PERIOD-TO-VOLTAGE CONVERTERS; PEAK-TO-PEAK DETECTORS; SAMPLE AND HOLD ANALOG MEMORIES; POSITIVE PEAK SENSE AND HOLD ANALOG MEMORIES; COORDINATE CONVERTERS; DIGITAL-TO-ANALOG CONVERTERS; MICROCOMPUTERS; POWER SUPPLIES; ABSOLUTE VALUE MODULES; ANALOG COMPARATORS; CHARGE AMPLIFIER-SAMPLE AND HOLD MODULES; AND THREE DIMENSIONAL DISPLAY SYSTEM MODULES