Who Invented Post-it note?1). William Friese-Greene2). Arthur Fry3). Gordon Gould4). Otto von Guericke
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1. Who invented Velcro?
2. Who invented Dynamite?
3. Who Invented Neon Lamp?
4. What was invented by J. B. Dunlop?
5. Who Invented postage stamp?
6. Who invented the waterproof raincoat?
7. Who Invented LED?
8. Piano was invented by ________.
9. Who invented Helicopter?
10. Which of the following was invented by Sir Humphry Davy?
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