1. Who invented Gramophone ?

Answer:

Emile Berliner in 1887.

2. Who invented Safety Pin ?

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

3. Who invented Neutron bomb ?

Answer:

Samuel T. Cohen

4. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

5. Who invented Submarine ?

Answer:

John Philip Holland

6. Who invented HIV ?

Answer:

7. Who invented Aspirin ?

Answer:

Felix Hoffmann invented Aspirin