1. Watt invented the steam engine.
2. Edison invented the electric light.
3. Bell invented the telephone.
4. Bushnell invented the submarine.
5. Judson, an American mechanic in Chicago, was the first to invent the zipper.
6. Harrison invented the first artificial refrigerator.
7. Sheffield invented the razor.
8. Edison invented the phonograph.
9. Roland Hill invented stamps.
10. The Wright brothers invented the airplane.
11. Many radio engineers invented radar.
12. Franklin invented lightning rod, etc.