(under subclass 98) Vaporizing apparatus having heads or domes that are provided with means for condensing, filtering, or otherwise treating vapors from the vaporizer.
SEE OR SEARCH CLASS
122, Liquid Heaters and Vaporizers,
508,.
159, Concentrating Evaporators,
31,.
165, Heat Exchange, appropriate subclasses for a heat exchanger not limited to the mineral oil art.
