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Across
  1. 3. Air-cushion vehicle
  2. 5. Interstate road system
  3. 8. Bass speaker
  4. 9. Protective breathing device
  5. 10. Wine opener
  6. 11. Ancient timekeeper
  7. 13. Non-lethal weapon
  8. 14. Building ascender
  9. 18. Skydiver's safety gear
  10. 20. One-wheeled cart
  11. 21. Aid auditory assist
  12. 24. Handheld math device
  13. 25. Arcade game machine
Down
  1. 1. Synthetic material
  2. 2. Logging tool
  3. 4. Tree-cutting tool
  4. 6. Dental hygiene product
  5. 7. Food storage innovation
  6. 12. Amplified speaking device
  7. 15. Early writing machine
  8. 16. Portable music player
  9. 17. Portable light source
  10. 19. Sharpener for writing tool
  11. 22. Noise-canceling inserts
  12. 23. Fastener tool