.~ Work chamber having gaseous material supply or removal structure {2}
205
.~.~ Having pump, jet or valve means establishing chamber pressure distinct from ambient
DEFINITION
Classification: 432/205
(under subclass 200) Apparatus providing for the supply, removal, or maintanence of work atmosphere to establish a pressure in the work chamber substantially greater or less than atmospheric pressure.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids,
92, for a drier treating material in a vacuum chamber.
373, Industrial Electric Heating Furnaces,
54, 63, 110+, and 140+ for an electric furnace in which the material is heated under pressure or under a vacuum.
