Bell's Photophone Invention - 搜索视频

PPT - The Invention of the Telephone PowerPoint Presentation, free download - ID:1129192

PPT - The Invention of the Telephone PowerPoint Presentation, free download - ID:1129192

The Invention of the Telephone. Inventor of the Telephone. Alexander Graham Bell invented a lot of things. He is known best for inventing the wonderful invention of the telephone. Bell invented the telephone in 1876 at the age of 29. The Invention Process.

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