1. Who invented Safety razor ?

Answer: King Camp Gillette of U.S.A. in 1903

2. Who invented Circulation of blood ?

Answer: William Harvey of Britain in 1628

3. Who invented Microphone ?

Answer:

Emile Berliner invented the first microphone in 1876.

4. Who invented Neutron ?

Answer:

JAMES CHADWICK in 1932

5. Who invented Steam Engine ?

Answer: Thomas Savery of Britain in 1698

6. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

7. Who invented Transistor ?

Answer: Bardeen, Shockley & Britain of U.S.A. in 1948