Q. Which of the following inventions were done by Thomas Alva Edison?
A. Incandescent lamp
B. Phonograph C (Gramophone) and microphone
C. Carbon telephone transmitters
D. All of the above
Answer: Option D
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A. Incandescent lamp
B. Phonograph C (Gramophone) and microphone
C. Carbon telephone transmitters
D. All of the above
Answer: Option D
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