- Aircraft/aerospace flight instruments and guidance systems (2)
- Acceleration indicators and systems components, aerospace (2)
- Aircraft flight instruments (1)
- Omnibearing indicators (1)
- Rate-of-climb instrumentation (1)
- Aircraft control systems, electronic (2)
- Navigational systems and instruments (2)
- Radar systems and equipment (1)
- Sonar systems and equipment (2)
- Nautical instruments (1)
- Sextants (1)
- Defense systems and equipment (2)
- Warfare counter-measure equipment (1)
- Air traffic control systems and equipment, electronic (1)
- Detection apparatus: electronic/magnetic field, light/heat (2)
- Radio magnetic instrumentation (1)
