![In 1939, Bell Telephone Laboratories completed this calculator, designed by researcher George Stibitz. #ThrowbackThur… | Throwback thursday, George, Complex numbers In 1939, Bell Telephone Laboratories completed this calculator, designed by researcher George Stibitz. #ThrowbackThur… | Throwback thursday, George, Complex numbers](https://i.pinimg.com/736x/7e/bd/f5/7ebdf5aa0c7b9bcebd0e70316c19c043--throwback-thursday-leveon-bell.jpg)
In 1939, Bell Telephone Laboratories completed this calculator, designed by researcher George Stibitz. #ThrowbackThur… | Throwback thursday, George, Complex numbers
![Bell Labs on Twitter: "Jan 8, 1940, Bell Labs engineer Dr. George Stibitz's full-scale relay calculator, the Complex Number Calculator, becomes operational. In Sep 1940, it became the 1st first computing machine Bell Labs on Twitter: "Jan 8, 1940, Bell Labs engineer Dr. George Stibitz's full-scale relay calculator, the Complex Number Calculator, becomes operational. In Sep 1940, it became the 1st first computing machine](https://pbs.twimg.com/media/DTCpOiSW4AEg_iP.jpg)
Bell Labs on Twitter: "Jan 8, 1940, Bell Labs engineer Dr. George Stibitz's full-scale relay calculator, the Complex Number Calculator, becomes operational. In Sep 1940, it became the 1st first computing machine
![A mechanical hand calculator made by Bell Punch Company Limited, a later variant of the popular German Brunsviga lever-operated calculator. Key driven... - SuperStock A mechanical hand calculator made by Bell Punch Company Limited, a later variant of the popular German Brunsviga lever-operated calculator. Key driven... - SuperStock](https://cdn.superstock.com/1895/Comp/1895-31476.webp)