Why do some things get "invented" and others being simply developed ? Roombe is based on other ideas and concpets. Even according to the timeline in the articl

Why do some things get "invented" and others being simply developed ? Roombe is based on other ideas and concpets. Even according to the timeline in the article itself the Swedish Electrolux Trilobite [1] was already press released when iRobot had their first proof of concept. [1] https://en.wikipedia.org/wiki/Electrolux_Trilobite https://en.wikipedia.org/wiki/Electrolux_Trilobite