From the film’s website:
Linotype: The Film is a feature-length documentary film centered around the Linotype typecasting machine invented by Ottmar Mergenthaler. Called the «Eighth Wonder of the World» by Thomas Edison, the Linotype revolutionized printing and society, but very few people know about the inventor or his fascinating machine.
The Linotype completely transformed the communication of information similarly to how the internet is now changing it all again. Although these machines were revolutionary, technology began to supersede the Linotype and they were scrapped and melted-down by the thousands. Today, very few machines are still in existence.