Respuesta :
He wasn't the inventor of the light bulb, but he did create the first commercially usable one.
Answer:
Carbon filament bulb is the correct answer.
Explanation:
Edison was not the inventor of bulb. The bulb was invented by Humphrey Davy in 1802. Edison did research to improve the incandescent bulb. He began to research in November 1878 and filed the patent on October 14th 1878. He filed the second patent on 4th November 1879. It was due to the changes his changes in the light bulb that made it possible for Thomas Edison's company to market and sell the new product. He simply took the invention and turned it into something that could be produced and sold in large quantities.
