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  1. Photophone - Wikipedia

  2. Alexander Graham Bell and the Photophone - ThoughtCo

  3. RCA Photophone - Wikipedia

  4. Photophone: How Alexander Graham Bell Transmitted Sound by …

  5. The Photophone - Scientific American

  6. Back to the future - In 1880 Alexander Graham Bell invented the ...

  7. Alexander Graham Bell Invents the Photophone, the First Wireless ...

  8. The Remarkable ‘Photophone’ of Alexander Graham Bell

  9. Photophone - Simple English Wikipedia, the free encyclopedia

  10. The Photophone: When Light Transmits Sound - BigSoundBank