Venn diagram was invented by1). Lucien Vidi2). John Venn3). Theophilus Van Kannel4). Lewis Urry
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3. Who invented Helicopter?
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5. What was invented by J. B. Dunlop?
6. Who discovered X-Ray?
7. Who Invented Dishwasher?
8. Barograph was invented by
9. General anaesthetic was invented by?
10. Piano was invented by ________.
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