Q. Which of the following inventions were done by Thomas Alva Edison?

  • (A) Phonograph C (Gramophone) and microphone
  • (B) Carbon telephone transmitters
  • (C) Incandescent lamp
  • (D) All of the above
✅ Correct Answer: (D) All of the above

Published by Ram Sharma ⭐ 193.88K Points at 19-Jan-2022 08:42 am in General Awareness

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