Who invented the electric tram?
1). James Cook
2). William Harvey
3). Fyodor Pirotsky
4). Robert Boyles
1. Who was the invertor of frozen foods?
2. Arithmometer was invented by
3. Who invented the vacuum pump?
5. What was invented by J. B. Dunlop?
6. The remains of an ancient civilization of 4000 BC were discovered in??..
7. Who is known for the invention of 'World Wide Web'?