1. Who invented Safety Pin ?

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

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented Biochemistry ?

Answer: Jan Baptista Van Helmont of Belgium in 1648.

4. Who invented Neon Lamp ?

Answer:

Georges Claude who was a French engineer, chemist and inventor

5. Who invented Computer ?

Answer:

Charles Babbage

6. Who invented Refrigerator ?

Answer:

Oliver Evans in 1805

7. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.