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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 duograph
 電影放映機; 雙色網目版印刷

From: Webster's Revised Unabridged Dictionary (1913)

 Du·o·graph n.  Photo-engraving A picture printed from two half-tone plates made with the screen set at different angles, and usually printed in two shades of the same color or in black and one tint.