1. (primitive) Diving bell
2. Fasten explosive devices
3. Compressed air (system)
4. 1864
5. Gasoline (engine)
6. Less explosive/volatile
7. Sailplanes
8. Periscope
9. Radio antenna
10. Rudder
11. Propeller
12. Stem planes
13. Outer hull
14. B
15. A
16. D
17. Yes
18. Not Given
19. No
20. Yes
21. No
22. A
23. B
24. C
25. A
26. C
27. D
28. E
29. A
30. C
31. B
32. Yes
33. Not Given
34. No
35. No
36. Yes
37. Yes
38. No
39. B
40. C

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