1. Who invented Machine Gun ?

Answer:

Helge Palmcrantz, Swedish inventor and industrialist

2. Who invented Open Heart Surgery ?

Answer:

Dr. Daniel Hale Williams

3. Who invented Piano ?

Answer:

Bartolomeo Cristofori

4. Who invented Periodic table ?

Answer:

Dmitri Mendeleev invented Periodic Table

5. Who invented Vitamin B1 ?

Answer:

Casimir Funk discovered in 1912

6. Who invented by Electric Lamp ?

Answer: Thomas Alva Edison of U.S.A. in 1879

7. Who invented Printing Press ?

Answer:

Johannes Gutenberg