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TELEMETRY SYSTEMS, DIGITAL PLOTTERS, COMPUTERS, AIRCRAFT SYSTEMS OPERATION AND MAINTENANCE TRAINING AID DEVICES, AIRCRAFT COMMAND CONTROL EQUIPMENT, ELECTRICAL AND ELECTRONIC TEST EQUIPMENT FOR PRODUCTION AND FLIGHT LINE TESTING OF AIRCRAFT ELECTRICAL AND ELECTRONIC SYSTEMS, INDUSTRIAL TAPE RECORDING EQUIPMENT, TIMERS EXCLUSIVE OF TIMERS FOR GROUND OR SURFACE VEHICLES (AS DISTINGUISHED FROM WATERCRAFT AND AIRPLANES, SPACECRAFT, MISSILES, SATELLITES AND OTHER AIRCRAFT) INCLUDING OFF-THE-ROAD MOBILE EQUIPMENT OR MACHINERY SUCH AS CONSTRUCTION, FARM OR OTHER LIKE MOBILE EQUIPMENT OR MACHINERY, AND COMPONENTS THEREOF