What businesses did Thomas Edison do?

Thomas Edison was involved in several businesses, most notably as the founder of General Electric, one of the largest and oldest publicly traded companies in the U.S. He also established the Edison Electric Light Company, focusing on electric lighting and power generation. Additionally, he operated the Edison Manufacturing Company, which produced phonographs and other electrical devices, and he held numerous patents that contributed to advancements in various industries, including telecommunications and recorded sound. Edison's entrepreneurial ventures significantly shaped the landscape of modern technology.