COMPUTERS AND COMPUTING APPARATUS, DATA PROCESSORS AND DATA PROCESSING APPARATUS, DATA CONVERTERS AND DATA CONVERSION APPARATUS, DATA TRANSMISSION APPARATUS, AND PARTS OF ALL THE FOREGOING; RECORDED TAPES AND DISKS-- ANTENNA COUPLERS; MAGNETIC DETECTORS AND PARTS OF ALL THE FOREGOING; ELECTRONIC AMPLIFIERS; ANTENNAS; A-C TO D-C AND D-C TO A-C CONVERTERS; ELECTRONIC COUPLERS; SIGNAL GENERATORS; MICRO-MINIATURE ELECTRONIC CIRCUITS; PHASE SHIFTERS; POWER SUPPLIES; ELECTRONIC MODULES CONSISTING OF INTERCONNECTED ELECTRONIC UNITS FOR USE IN ELECTRONIC SYSTEMS, APPARATUS AND DEVICES; RADIO TRANSMITTERS AND TRANSPONDERS; MICROWAVE DIRECTIONAL COUPLERS; ELECTRIC TRANSMISSION LINES; INERTIAL NAVIGATIONAL OR GUIDANCE APPARATUS FOR SENSING COMPONENTS VEHICLE ACCELERATION; ACCELEROMETERS; RATE SENSORS; GYROSCOPES AND GYROSCOPIC APPARATUS; NAVIGATIONAL APPARATUS, NAVIGATIONAL INSTRUMENTS, NAVIGATIONAL SYSTEMS, FLIGHT CONTROL APPARATUS, FLIGHT CONTROL INSTRUMENTS, FLIGHT CONTROL SYSTEMS, STABILIZATION APPARATUS, STABILIZATION INSTRUMENTS, STABILIZATION SYSTEMS, ALL FOR USE IN AIR OR SPACE CRAFT; ALTIMETERS; PRESSURE REFERENCE APPARATUS FOR SIMULATING FLIGHT CONDITIONS DURING AIRCRAFT MAINTENANCE AND TESTING OPERATIONS; ENGINE CONTROL AND/OR INDICATING APPARATUS FOR MARINE AND AIRCRAFT; STEERING APPARATUS FOR MARINE CRAFT; COMPASSES AND HEADING-INDICATION APPARATUS EMPLOYING COMPASSES; RADARS AND RADAR APPARATUS; FREQUENCY ANALYZERS; NAVIGATIONAL SYSTEMS FOR MARINE CRAFT AND APPARATUS THEREFOR-NAMELY-- NAVIGATION SYSTEMS EMPLOYING GYROSCOPIC APPARATUSAND/OR ACCELEROMETERS, COLLISION WARNINGAND/OR NAVIGATION ASSESSMENT APPARATUS, RECEIVERS FOR USE IN OMEGA NAVIGATION SYSTEMS; NAVIGATIONAL CONSOLES FOR AIR ANDMARINE CRAFT; SPEED AND/OR DIRECTION CONTROL APPARATUS, INSTRUMENTS AND MECHANISMS FOR LAND, MARINE, AIR AND SPACE CRAFT; STABILIZERS AND STABILIZATION APPARATUS FOR MARINE CRAFT; SONAR SYSTEMS COMPRISING SOUND WAVE TRANSMITTERS AND RECEIVERS; ELECTRICAL APPARATUS FOR TESTING THETHE OPERABILITY AND CHARACTERISTICS OF ELECTRONIC CIRCUITS AND DEVICES; ELECTRICAL, MAGNETIC, MECHANICAL AND PNEUMATIC APPARATUS FOR TESTING THE OPERABILITY ANDCHARACTERISTICS OF AERONAUTICAL INSTRUMENTS AND STRUCTURAL COMPONENTS; MAGNETIC FIELD SENSITIVE FLUX VALVES AND COMPENSATORS FOR DETERMINING DIRECTION AND STRENGTH OF MAGNETIC FIELDS; LASERS AND LASERAPPARATUS; LORAN NAVIGATION INSTRUMENTS AND APPARATUS; MAGNETIC DETECTION SYSTEMS, ANALYZERS, AND SENSORS; SERVO-MECHANISMS; AND PARTS FOR ALL THE ABOVE-MENTIONGOODS