Important Inventions and Discoveries in World » Exercise - 190. Who invented Gramophone? (a) Michael Faraday (b) Fahrenheit (c) Sir Alexander Graham Bell (d) Thomas Alva Edison
Important Inventions and Discoveries in World » Exercise - 188. Who invented Dynamite? (a) Sir Alexander Graham Bell (b) Benjamin Franklin (c) Thomas Alva Edison (d) Alfred B. Nobel
Important Inventions and Discoveries in World » Exercise - 115. Who invented the phonograph? (a) Thomas Edison (b) John Kruesi (c) Jules Levy (d) Alexander Graham Bell
Important Inventions and Discoveries in World » Exercise - 189. Who invented Bifocal Lens? (a) Alfred B. Nobel (b) Thomas Alva Edison (c) Benjamin Franklin (d) Rudolf Diesel