1. Who invented Safety razor ?

Answer: King Camp Gillette of U.S.A. in 1903

2. Who invented Transistor ?

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

3. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

4. Who invented Chemotherapy ?

Answer: Paracelsus of Switzerland

5. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.

6. Who invented Super Computer ?

Answer:

Seymour Cray

7. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist