1887: Heaviside discovers inductive loading for telephone lines
1900: Pupin loading coils patented
1900: Fessenden achieves first wireless voice transmission
Loading coil extends long-distance
1906: De Forest Audion triode invented
1913: Vacuum tube repeater demonstrated
1915: Arnold perfects the vacuum-tube telephone amplifier
1920: Otto Zobel invents m-derived filters
1925: Bell Labs founded, in NYC
1927: Black invents the negative feedback amplifier
1927: Ives demonstrates the first television telephone
1930: Anti-sidetone circuit developed
1937: Alec Reeves invents pulse code modulation
1940: A Modern Aladdin's Lamp, About Vacuum Tubes (Western Electric)
1942: Hedy Lamarr patents Secret Communications System
1947: Transistor invented at Bell Labs
1948: Bottle of Magic (The Vacuum Tube)
1948: Shannon publishes A Mathematical Theory of Communication
1953: The Transistor (Bell System)
1956: The Bell Solar Battery
Improved echo suppressors deployed
1965: Genesis of the Transistor (Bell Labs)
1965: Lucky invents the adaptive equalizer
1966: Kao proves fiber optics can carry telephone signals
1973: Metcalfe invents Ethernet
1974: Cerf and Kahn design TCP/IP
1980: Harold Black and the Invention of the Negative Feedback Amplifier (AT&T)
1982: UNIX: Making Computers Easier To Use (Bell Labs)
1988: Inventing the Laser (Bell Labs)