(under subclass 201) Apparatus including means to vent the gases or vapors evolved due to treatment of the material.
(1) Note. For means to vent gases and/or vapors which contact material for treatment, see this class, subclasses 210 and 218 and their indented subclasses.
(2) Note. See process subclass 521 and apparatus subclass 72 and indented subclasses of this class for means to treat the treating gas or vapors or the evolved gases or vapors, and subclass 92 for vacuum apparatus.
