1. Who invented watch ?

Answer:

Peter Henlein invented the first portable time piece in 1504

2. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

3. Who invented Electron ?

Answer: Thomson. J of Britain in 1897

4. Who invented Automatic rifle ?

Answer: John Browning of U.S.A. in 1918.

5. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

6. Who invented HIV ?

Answer:

7. Who invented Vitamin K ?

Answer: Doisy Dam of U.S.A. in 1938.