1. Who invented Piano ?

Answer:

Bartolomeo Cristofori

2. Who invented Radiocarbon ?

Answer:

Willard Libby

3. Who invented Safety Pin ?

Answer: Walter Hunt of U.S.A. in 1849

4. Who invented Aspirin ?

Answer:

Felix Hoffmann invented Aspirin

5. Who invented Steam Engine (Condenser)

Answer: James Watt of Britain in 1765

6. Who invented Submarine ?

Answer:

John Philip Holland

7. Who invented Printing Press ?

Answer:

Johannes Gutenberg