a Full Line of Aircraft Navigation and Control Instruments-Namely, Flight Instruments-Namely, Horizon Gyroscopes, Directional Gyroscopes, Flight Directors, Altitude Director Indicators, Horizontal Situation Indicators, Air Speed Indicators, Vertical Speed Indicators and Encoding Altimeters; Engine Instruments-Namely, Engine Gauges, Engine Instrument Clusters, Cluster Modules, Manifold Pressure Gauges, Full Pressure Gauges, Tachometers and Syncroscopes, and Parts Therefor; Radio Controls-Namely, VHF Navigation Controls, VHF Communication Controls, HF Communication Controls, Automatic Direction Finder (ADF), Automatic Temperature Control (ATC) Transponders, Weather Radar and Omni Bearing Selectors; and Audio Amplifiers-Namely, Audio Panels, Interphone Amplifiers, Isolation Amplifiers, and Speaker Amplifiers