Powdering devices, e.g. for preventing set-off

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Devices for treating the surfaces of sheets, webs, or other articles in connection with printing (as a final step in the manufacture of such articles, see the relevant places, e.g. B29C71/00, D21H23/00 or D21H25/00; after-treatment of prints B41M7/00) > by heat drying, by cooling, by applying powders > Powdering devices, e.g. for preventing set-off