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Rotary (Steam powered) Press is invented by Richard M. Hoe.

Date(s)
July 30, 1844
Rotary press for commercial mass production invented by Richard M. Hoe. Powered by steam, this produces millions of copies per day, but is not used for pamphlets or small runs, for which handpress is mainly used and then letterpress.
Sources
Malone, Patrick M. "A History of Industrial Power in the United States, 1780–1930. Vol. 3: The Transmission of Power." By Louis C. Hunter and Lynwood Bryant. Cambridge: The MIT Press, 1991. Pp. xxv, 596. The Journal of Economic History 53.03 (1993): 711-712.

"Richard Hoe's 6-cylinder Rotary Printing Press." Digital image. Wikipedia. Accessed December 09, 2015. https://upload.wikimedia.org/wikipedia/commons/0/03/Hoe's_six-cylinder_press.png.
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