(under subclass 72) Subject matter wherein the photos:graphic paper is held by air or atmospheric pressure caused either by forming a partial vacuum on one side of the paper or by blowing air against the paper.
SEE OR SEARCH THIS CLASS, SUBCLASS:
76, for vacuum, fluid, or spring pressure meant for holder of original.
SEE OR SEARCH CLASS
248, Supports,
362, and 363 for vacuum holddown devices of general utility.