1. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

2. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

3. Who invented Laser ?

Answer:

Charles H. Townes

4. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

5. Who invented Bicyle ?

Answer: Kirkpatrick Macmillan of Britain.

6. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

7. Who invented Safety Pin ?

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