Thomas Edison Thomas Edison Thomas Alva Edison (February 11, 1847October 18, 1931) was an American inventor and businessman, who has been described as America's greatest inventor. He is credited with developing many devices in fields such as electric power generation, mass communication, sound recording, and motion pictures. These inventions, which include the phonograph, the motion picture camera, and the long-lasting, practical electric light bulb, had a widespread impact on the modern industrialized world. He was one of the first inventors to apply the principles of mass production and teamwork to the process of invention, working with many researchers and employees. He is
Thomas Leavitt (inventor) volumes of United States mail. Thomas Leavitt, who set off the stampede with his first design, was married to Martha Elizabeth Whittier of Cornville, Maine, in 1851. The inventor died in 1899 and his wife Martha died in 1910. The couple had four children. Thomas Leavitt (inventor) Thomas Leavitt (1827–1899) patented, along with his brother Martin Leavitt, the first machine in the U.S. that made machine-cancelled postal letters practicable, enabling the United States Post Office to increase the volume of mail it handled, quickening the pace of delivery and allowing customers to more easily send letters of various sizes. Leavitt,