- Who invented optical fiber?
- Bulb was invented by?
- The US president who invented the swivel chair, the spherical sundial, the moldboard plow, and the cipher wheel was___________?
- The drawback of this battery is the working voltage of battery is _________ due to the internal losses
- In 1940, first electronic computer was invented by_______?
- When was the game Frisbee invented?
- When was helicopter Invented?
- Edwin Budding who invented Lawnmover belongs to__________?
- Eyeglasses are invented in Italy in________?
- Jet Engine was invented by_____________?
- Who invented the safety pin?
- Radio was invented by_____________in 1895?