Links about printing history, and Heidelberg, one of the world's leading print press manufactures.

History of Printing Wikepedia	https://en.wikipedia.org/wiki/History_of_printing

Heidleberg Printing Company	https://www.heidelberg.com/us/en/index.jsp

History. com	https://www.history.com/topics/inventions/printing-press

Video - Heidelberg Primefire 106 digital press	https://www.youtube.com/watch?v=66YAG0HVDNw