1. Who invented Safety Pin ?

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

2. Who invented Piano ?

Answer:

Bartolomeo Cristofori

3. Who invented Air Conditioning ?

Answer:

Willis Carrier in 1902

4. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

5. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

6. Who invented Bakelite ?

Answer: Leo H. Baekeland of Belgium in 1907.

7. Who invented Telescope ?

Answer: Hans Lippershey of Netherlands in 1608.