- Aircraft/aerospace flight instruments and guidance systems (8)
- Acceleration indicators and systems components, aerospace (6)
- Aircraft flight instruments (5)
- Airspeed instrumentation (aeronautical instruments) (1)
- Bank and turn indicators and components (1)
- Electronic detection systems (aeronautical) (1)
- Flight recorders (1)
- Infrared object detection equipment (2)
- Aircraft control instruments (2)
- Aircraft control systems, electronic (5)
- Navigational systems and instruments (5)
- Antennas, radar or communications (1)
- Compasses and accessories (3)
- Radar systems and equipment (10)
- Sonar systems and equipment (7)
- Space vehicle guidance systems and equipment (3)
- Nautical instruments (2)
- Hydrophones (1)
- Sextants (2)
- Defense systems and equipment (8)
- Warfare counter-measure equipment (1)
- Search and detection systems and instruments (4)
- Air traffic control systems and equipment, electronic (1)
- Detection apparatus: electronic/magnetic field, light/heat (6)
- Magnetic field detection apparatus (2)
- Distance measuring equipment (1)
