Just like viruses, elements of previous technologies embed themselves into inventors' designs:

On 21-22 October 1879, Edison and his staff conducted their first successful experiments with a carbon-filament lamp in a vacuum. The filament was made from a piece of carbonized thread. By New Year's he was demonstrating lamps using carbonized cardboard filaments to large crowds at the Menlo Park laboratory. A year later, Edison began manufacturing commercial lamps using carbonized Japanese bamboo as filaments.

1904 Fleming invents the vacuum diode

British engineer Sir John Ambrose Fleming invents the two-electrode radio rectifier; or vacuum diode, which he calls an oscillation valve. Based on Edison's lightbulbs, the valve reliably detects radio waves. Transcontinental telephone service becomes possible with Lee De Forest's 1907 patent of the triode, or three-element vacuum tube, which electronically amplifies signals.


1943 First vacuum-tube programmable logic calculator

Colossus, the world’s first vacuum-tube programmable logic calculator, is built in Britain for the purpose of breaking Nazi codes. On average, Colossus deciphers a coded message in two hours.