1. Who invented Safety Pin ?

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

2. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

3. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

4. Who invented Diesel Engine ?

Answer: Rudoff Diesel of Germany in 1895

5. Who invented CT scan ?

Answer: Hounsfield by Britain in 1973.

6. Who invented Vitamin B1 ?

Answer:

Casimir Funk discovered in 1912

7. Who invented HIV ?

Answer: