Gutenberg revolutionized the printing process by creating moveable type around 1439 and his methods were used in the printing industry until the prototype Linotype hot-metal typesetting machine was introduced in 1886. (Note: the Linotype inventor, Ottmar Mergenthaler, is less well-known than Gutenberg.)
The Linotype typesetting machine revolutionized and dominated the print industry until the invention of phototypesetting around the 1940s.
You can learn about the history of the Linotype hot-metal typesetting machine in the marvelous movie: Linotype Film at http://www.linotypefilm.com.
Learn about the development of phototypesetting in Hot Metal to Cold Type, a film in the online history of the printed word at PrintngFilms.com
Unfortunately, I have been unable to find a film history of The Compugraphic 7500 phototypesetting machine which was one of several phototypesetting machines popular with small newspapers and graphic shops in the 1970s.