1. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented Submarine ?

Answer:

John Philip Holland

4. Who invented Vaccine of Rabies ?

Answer: Louis Pasteur of France in 1885

5. Who invented Atomic theory ?

Answer: Dalton of Britain in 1803.

6. Who invented Radar ?

Answer:

Sir Robert Watson-Watt

7. Who invented Safety Pin ?

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