US PATENT SUBCLASS 237 / 78 A
Current as of: June, 1999
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Unofficial Alpha Subclasses: R A B C
(under subclass 70) Radiators combined with means for moistening the air or air moistening apparatus necessitating its application to a radiator when in use.
SEE OR SEARCH CLASS
236, Automatic Temperature and Humidity Regulation,
12.1+, for fluid mixers and 44, for humidity control.
261, Gas and Liquid Contact Apparatus, appropriate subclasses for contact structure.
110, 157, 223, 291, 328, and 337 for ventilators having liquid contact devices.