1. Bell's invention was based on the idea of using electrical signals to transmit sound, which was a new concept at the time

2. Bell's telephone consisted of a transmitter, which converted sound into electrical signals, and a receiver, which converted the signals back into sound

3. Fue inventado en 1876 por Alexander Graham Bell y desde entonces ha evolucionado para incluir un

4. Fue inventado en 1876 por Alexander Graham Bell y desde entonces ha revolucionado la forma en que las personas se comunican

5. The invention of the telephone can be traced back to Alexander Graham Bell, who is credited with patenting the first practical telephone in 1876

6. The telephone quickly caught on, and by 1878, Bell's company, the Bell Telephone Company, had more than 50,000 subscribers