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ELECTRONIC DEVICES FOR LOCATING AND TRACKING PERSONNEL AND VEHICLES USING RADIO FREQUENCY; ELECTRONIC TRANSMITTERS AND RECEIVERS FOR LOCATION TRACKING; ELECTRIC MONITORING APPARATUS, NAMELY, RADIO WAVE TRANSMITTERS AND RECEIVERS; RADIO WAVE TRANSMITTER AND RECEIVER DEVICES; ELECTRONIC DATA LOGGERS; MEASURING INSTRUMENTS, NAMELY, INERTIAL MEASUREMENT UNITS; ELECTRICAL SENSOR CONTROLLERS; POWER AMPLIFIERS; ELECTRONIC DISPLAY INTERFACES