- Avionics (495)
- Communication systems (mechanical and electrical systems) (475)
- Testing equipment (309)
- Protective and life-saving equipment (284)
- Tools (247)
- Artificial satellites (120)
- Electrical systems (75)
- Scientific instruments (66)
- Parachutes (life-saving equipment) (49)
- Instructional materials (48)
- Containers (42)
- Breathing devices (30)
- Landing equipment (11)
- Specimens (9)
- Power producing equipment (7)
- Antennas (5)
- Autopilots (5)
- Meteorological instruments (5)