(under the class definition) Apparatus having (1) two or more change of material phase producing closed circuits each having a different manner of operation, e.g., a primary compressor-condenser-expander circuit combined with a secondary condenser-evaporator circuit; a still-condenser-expander circuit combined with a compressor-condenser-expander-circuit, (2) change of phase closed circuits cooling one treating zone combined with cooling means using a solid or liquid which by change of phase cools another treating zone, or (3) apparatus having confining means each supporting or confining refrigerants or
coolants of different kinds, e.g., water, ice and dry ice.
SEE OR SEARCH THIS CLASS, SUBCLASS:
79, for processes involving exchange of heat between plural systems.
175, for automatic control of diverse, cascade or compound systems.
311+, for gas and liquid contact cooling means combined with other cooling means.
335, for a plural paired system and see the Notes thereto.
