Printing plate unit
United States Patent 2108039

Inventors:
Betts, Gilbert A.
Publication Date:
02/15/1938
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Assignee:
UNIVERSAL ENGRAVING & COLORPLA
Primary Class:
101/401.200
Other Classes:
430/22, 430/300, 101/DIG.036, 101/395
International Classes:
G03F9/00