1. Who invented Ball-Point Pen ?

Answer: John J. Loud of U.S.A. in 1888

2. Who invented Printing Press ?

Answer:

Johannes Gutenberg

3. Who invented Piano ?

Answer:

Bartolomeo Cristofori

4. Who invented Stainless Steel ?

Answer: Harry Brearley of Britain in 1913.

5. Who invented Locomotive ?

Answer:

George Stephenson was first to buit steam locomotives.

6. Who invented Vitamin A ?

Answer: Mc Collum and M.Davis of U.S.A. in 1913

7. Who invented Dynamo ?

Answer:

Hypolite Pixii of France in 1832