At the 1876 Centennial Exposition in Philadelphia, inventor Alexander Graham Bell displayed several telephones, including this one. It is today at the National Museum of American History, and a 3D scan of the device can be found on the museum’s website: https://tinyurl.com/yckv3ffs
Image: “Alexander Graham Bell Experimental Telephone” by Alexander Graham Bell (1876). From the National Museum of American History.
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