Spirit Duplicator
From Dead Media Archive
Spirit Duplicator ...
Works Cited
Gardiner, A. W. Typewriting and Office Duplicating Processes. New York: Focal Press, 1968.
Rhodes, Barbara J. and Streeter, William W. Before Photocopying : The Art and History of Mechanical Copying, 1780-1938: A book in two parts. New Castle and Northampton: Oak Knoll Press and Heraldry Bindery, 1999.