- Aircraft/aerospace flight instruments and guidance systems (3)
- Acceleration indicators and systems components, aerospace (3)
- Aircraft control systems, electronic (2)
- Navigational systems and instruments (1)
- Compasses and accessories (1)
- Radar systems and equipment (3)
- Sonar systems and equipment (3)
- Defense systems and equipment (4)
- Search and detection systems and instruments (1)
- Air traffic control systems and equipment, electronic (1)
- Detection apparatus: electronic/magnetic field, light/heat (1)
