Once they had the ink, Cho and his colleagues built roll printers to transfer ink to the final material.

这种油墨一创造出来后，乔和他的同事便造出滚式印刷机，以便将油墨转移到最终所需印刷材料上。

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Grant McKinnon, a poster dealer in San Francisco, explains that in the rock'n'roll field, many of the original artists, printers and negatives are still around, so primary-source knowledge is fairly easy to come by.

ECONOMIST: Print graphics