What are Edison's four great inventions?

Phonographs, electric lights, power systems and talking movies. These inventions have had a profound impact on human life, not only changed people's way of life, but also greatly promoted the development of science and technology in the world. Edison obtained 1093 invention patents in his life, including incandescent lamp, phonograph, film projector, camera and so on. He was rated as the ninth among 100 people who influenced the United States by the media, and he was one of the famous geniuses in the history of technology.