- Aircraft flight instruments (1)
- Airspeed instrumentation (aeronautical instruments) (2)
- Inertial guidance systems (2)
- Aircraft control systems, electronic (1)
- Automatic pilots, aircraft (1)
- Navigational systems and instruments (3)
- Radar systems and equipment (1)
- Nautical instruments (1)
- Detection apparatus: electronic/magnetic field, light/heat (3)
