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MEDICAL ELECTRONICS INSTRUMENTATIONS, RECORDING CARDIAC OSCILLOSCOPES AND CARDIAC TACHOMETERS, CARDIAC ALARM AND CONTROL PANELS, CARDIAC SHOCK UNITS, CARDIAC OUTPUT COMPUTERS, PRE-AMPLIFIERS, AMPLIFIERS, POWER SUPPLIES, TRANSMITTERS, RECEIVERS, RECEIVING ANTENNAS, ELECTRONIC RECORDING SYSTEMS, MAGNETIC MEMORY TAPE LOOPS, AND ELECTRONIC PRESSURE TRANSDUCERS USED IN MEDICAL INSTRUMENTS