Invented the voting recorder, the gramophone, the movie projector, the light bulb, and the mimeograph
The voting recorder: He invented a voting recorder that simplified voting procedures and prevented voting fraud. His first invention was a success.
Gramophone: The first invention that brought him fame was the phonograph in 1877.
Movie projector: Edison was inspired by a children's toy. If the photos were connected and moved quickly, they would form a continuous motion in the eyes. Edison also used film to create a movie projector.
Mimeograph: Mimeograph was a method of printing on wax paper before computer printing became popular. It was once very popular in schools and businesses due to the simple tools and materials required. The main tools are writing steel plates, writing pens, wax paper, ink, and white paper.
Extended information:
In fact, Edison was just an improver of electric lights. Electric lights existed decades before him, and he was not even the first person to popularize them commercially. But Edison is still the undisputed king of inventions. His contribution is not only great inventions such as the electric light and the phonograph, but more importantly, he re-invented the "invention" itself in a sense.
Incandescent lamps use the thermal effect of electric current, and some substances will emit light when heated. This phenomenon was known to electricians as early as the 18th century. At the beginning of the 19th century, before batteries and generators were developed, British electrician David used 2,000 capacitor bottles to discharge a thin platinum strip, demonstrating the most primitive incandescent lamp. In the following decades, researchers continued to try to improve the design of incandescent lamps. They used carbon rods, platinum wires, iridium wires, etc. as conductors, and also tried to place the filaments in vacuum containers.
Reference: Thomas Alva Edison (famous American inventor and entrepreneur)_Baidu Encyclopedia