| 01. | Air Brake | : George Westinghouse |
| 02. | Adding Machine | : Balise Pascal |
| 03. | Aero plane | : Wright Brothers |
| 04. | Air Conditioner | : Carrier |
| 05. | Atom Bomb | : Otto Hahn |
| 06. | Aspirin | : Dresser |
| 07. | Alcohol Thermometer | : Fahrenheit |
| 08. | Atomic Thermometer | : Bohr |
| 09. | Atomic Theory | : Dalton |
| 10. | Atomic Number | : Mosley |
| 11. | Atomic Structure | : Bohr and Rutherford |
| 12. | Automobile | : Daimler |
| 13. | Antiseptic Surgery | : Lord Joseph Lister |
| 14. | Archimedean Screw | : Archimedes |
| 15. | Avogadro’s Hypothesis | : Avogadro |
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