1. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented google ?

Answer:

Larry Page

4. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

5. Who invented Steam Engine (Piston)

Answer: Thomas Newcomen of Britain in 1712

6. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

7. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.