engineers

Across

3. Fire extinguisher
5. internet
7. Cameras
10. bridges
11. car sensors
12. World Wide Web
15. radio
17. AI expert systems
18. Mobile refrigeration system
20. printers

Down

1. aircraft
2. AI learning infrastructure
4. war machines
6. Bombs
8. artificial organs
9. landfill lining systems
13. water generators
14. space exploration rovers
16. Industrial robots
19. x-rays