The invention of the telephone is a subject of great controversy, central is which is the patent issued to Alexander Graham Bell on March 7, 1876. Many problems

The invention of the telephone is a subject of great controversy, central is which is the patent issued to Alexander Graham Bell on March 7, 1876. Many problems

Telephone.

Fernsprechtechnik, Telefonie (Technik).

No other source could ever equal Bell's personal and detailed description of the steps leading to his remarkable invention. This description is included in Bell