(under subclass 39) Housings including claimed structure which is disclosed as acting to seal the work exit passageway to prevent ingress of luminary rays or of liquids or gases into an otherwise sealed housing.
(1) Note. These housings usually protect specially treated paper such as photos:graphic or litmus paper.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids,
242, for chamber seals and see the Notes thereto for completing the search for this subject matter.
