| S.No | Discover | Scientist | Image | Country/ Year |
| 21 | Motor car(petrol) | Karl Benz |
 |
Germany, 1885 |
| 22 | Motorcycle | Edward Butler |
 |
England, 1884 |
| 23 | Printing Press | J. Gutenberg |
 |
Germany1455 |
| 24 | Radium | Marie and Pierre Curie |
 |
France, 1898 |
| 25 | Radio | G.Marconi |
 |
England, 1901 |
| 26 | Razor (safety) | K.G. Gillette |
 |
USA, 1895 |
| 27 | Refrigerator | J. Harrison and A. Catlin |
 |
Britain 1834 |
| 28 | Rubber(vulcanized) | Charles Good year |
 |
USA, 1841 |
| 29 | Safety pin | William Hurst |
 |
USA, 1849 |
| 30 | Sewing machine | B. Thimmonnier |
 |
France, 1830 |
| 31 | Steam engine (piston) | Thomas Newcome |
 |
Britain, 1712 |
| 32 | Steam engine (condenser) | James Watt |
 |
Scotland1765 |
| 33 | Stainless Steel | Harry Brearley |
 |
England, 1913 |
| 34 | Telephone | Alexander Graham Bell |
 |
USA, 1876 |
| 35 | Television | John Logie Bared |
 |
Scotland, 1926 |
| 36 | Thermometer | Galileo Galilei |
 |
Italy, 1593 |
| 37 | Tractor | J.Froelich |
 |
USA, 1892 |
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