1. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

2. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948

3. Who invented Vaccine of Rabies ?

Answer: Louis Pasteur of France in 1885

4. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

5. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

6. Who invented by Electric Lamp ?

Answer: Thomas Alva Edison of U.S.A. in 1879

7. Who invented HIV ?

Answer: