1. Who invented Stethoscope ?

Answer: Laennec of French in 1819.

2. Who invented Blood Transfusion ?

Answer: Jean-Baptiste Denys of France in 1625.

3. Who invented Safety razor ?

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

4. Who invented Radiocarbon ?

Answer:

Willard Libby

5. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

6. Who invented Transistor ?

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

7. Who invented Biochemistry ?

Answer: Jan Baptista Van Helmont of Belgium in 1648.