- Aircraft/aerospace flight instruments and guidance systems (14)
- Acceleration indicators and systems components, aerospace (8)
- Aircraft flight instruments (2)
- Electronic detection systems (aeronautical) (2)
- Flight recorders (1)
- Aircraft control instruments (1)
- Aircraft control systems, electronic (3)
- Navigational systems and instruments (11)
- Antennas, radar or communications (1)
- Compasses and accessories (2)
- Sonar systems and equipment (10)
- Space vehicle guidance systems and equipment (2)
- Nautical instruments (3)
- Fathometers (1)
- Hydrophones (1)
- Defense systems and equipment (8)
- Search and detection systems and instruments (1)
- Detection apparatus: electronic/magnetic field, light/heat (3)
- Magnetic field detection apparatus (1)
