1. Who invented Automatic rifle ?

Answer: John Browning of U.S.A. in 1918.

2. Who invented Neon Lamp ?

Answer:

Georges Claude who was a French engineer, chemist and inventor

3. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

4. Who invented Barometer ?

Answer: Evangelista Torricelli of Italy in 1644

5. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

6. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

7. Who invented Locomotive ?

Answer:

George Stephenson was first to buit steam locomotives.