(under subclass 524) Apparatus in which the moisture content or relative humidity of the gas or vapor that contacts the material being treated is controlled.
(1) Note. Humidostatic control of heaters for the treating gas or vapor is in subclasses 549+ and 556, even though a change in humidity is the claimed result.
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467+, and appropriate indented subclasses, for other treatment of treating gas or vapor that is not automatically controlled.
548, for mixing two gas streams even though a change in humidity is the claimed result.
