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GAS AND LIQUID FLOW AND TEMPERATURE SENSORS; LASER VELOCIMETRY UNITS AND PARTS THEREFOR; OPTICAL COMPONENTS FOR LASER VELOCIMETRY UNITS; LASERS; SIGNAL PROCESSORS, COMPUTERS; COMPUTER INTERFACE UNITS AND COMPUTER PROGRAMS FOR USE WITH GAS OR LIQUID FLOW MEASUREMENT APPARATUS; PREAMPLIFIERS; POLARIZATION AXIS FINDERS; FREQUENCY SHIFTERS; HOT WIRE AND HOT FILM ANEMOMETERS; ANEMOMETRY INSTRUMENTS AND PARTS THEREFOR; COMPUTER PROGRAMS AND INTERFACE UNITS FOR USE WITH ANEMOMETERS; ANEMOMETER PROBES AND SENSORS; MANOMETERS; GAS FLOW AND VELOCITY TEST INSTRUMENTS; MASS FLOW TRANSDUCERS; AIR VELOCITY TRANSDUCERS, SIGNAL CONDITIONERS, AIR VELOCITY METERS; AIR VELOCITY METER CALIBRATORS; WIND VELOCITY SENSORS; INTELLIGENT FLOW ANALYZERS; AIR POLLUTION MEASURING AND/OR CONTROL INSTRUMENTS; AEROSOL NEUTRALIZERS; CONDENSATION NUCLEUS COUNTERS; ELECTRICAL CLASSIFIERS; ELECTROSTATIC AEROSOL SAMPLERS; ISOKINETIC DUST SAMPLERS; ELECTRONIC RESPIRABLE AEROSOL MASS MONITORS; PARTICLE IMPACTORS; COMPUTER PROGRAMS AND INTERFACE UNITS FOR UNIT WITH PARTICLE TECHNOLOGY INSTRUMENTS; MEASUREMENT INSTRUMENTS FOR USE IN DETERMINING AERODYNAMIC PARTICLE SIZE; OPTICAL PARTICLE COUNTERS; DIFFERENTIAL MOBILITY PARTICLE SIZE ANALYZERS; FUME HOOD CONTROLLERS; MONITORS FOR MEASURING THE VELOCITY OF PARTICLES MOVING IN A MEDIA; SURFACE MOTION MONITORS; ROOM PRESSURE SENSORS; ROOM PRESSURE CONTROLLERS; WIND TUNNELS; AND FLOW CALIBRATORS