Photogravure printing plate and method of and apparatus for producing the same
United States Patent 2182559

Inventors:
Henderson, Charles L.
Publication Date:
12/05/1939
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Assignee:
PAPER PATENTS CO
Primary Class:
359/893
Other Classes:
101/170, 430/308, 101/150, 101/401.100, 430/307
International Classes:
G03F5/20; G03F5/00