Across
- 8. — Railway engine
- 11. — Underwater vessel
- 13. — Postal invention
- 15. — Rotating power device
- 16. — Small object viewer
- 18. — Aircraft power unit
- 20. — Electric light source
Down
- 1. — Early power machine
- 2. — Two wheel transport
- 3. — Image capturing device
- 4. — First antibiotic
- 5. — Moving picture screen
- 6. — Textile machine
- 7. — Voice communication device
- 9. — Armored vehicle
- 10. — Object detection system
- 12. — Energy storage unit
- 14. — Direction finder
- 17. — Timekeeping device
- 19. — Early message system