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ELECTRONIC INSTRUMENTS FOR USE IN DIAGNOSTIC, MEASURING AND TESTING INTERNAL COMBUSTION ENGINES, AND ELECTRICAL AND ELECTRONIC CIRCUITS NAMELY DIGITAL TACHOMETERS, DIGITAL MULTIMETERS, DIGITAL IGNITION METERS, CIRCUIT TESTERS, SHORT AND OPEN CIRCUIT TRACERS, DIGITAL THERMOMETERS, OSCILLOSCOPES, COMPRESSION TESTERS, PRESSURE METERS AND ENGINE ANALYZERS