Push-Button Telephone – 1948
Rotary phones were the standard model in the 1940s, Bell Labs engineers were the first to design the push-button handset. Each button had a corresponding 3-inch reed, which was plucked when pressed – its own version of the modern day key tone. A yearlong trial saw 35 test units sent to phone company employees, but the project ended up as a flop. Push-button phones resurfaced in 1963, replacing the idea of reeds with solid electronics.