Thomas Edison and Joseph Swan
Both developed the light bulb. One of the most influential and impactful inventions of the Industrial Revolution and all of history. The lightbulb allowed homes and streets to be illuminated. Factories also greatly benefitted from this, with conveyor belts, machines, etc. now being able to be powered. Thomas Edison had a record 1,093 patrons and is known as the "Wizard of Wenlo Park". Swan was actually the first to show a lightbulb that actually worked and when he patented his idea, it was so influential that Thomas Edison merged with Swan to both be credited with the creation of the lightbulb. The creation of the lightbulb is still today on of the most impactful invention of all time.