Examine the various innovations in print technology in late 19th century and early 20th century?

Various innovations in print technology
(i) In New York, Richard M. Hoe perfected the power-driven cylindrical press. This enabled one to print 8000 sheets of paper in an hour.
(ii) In 19th century the offset press was developed which could print up to six colours at a time.
(iii) From 20th century, electrically operated presses speeded up printing operations.
(iv) Automatic paper reels and photo electric controls of the colour register were introduced.
All these transformed the appearance of the printing press.