(under subclass 175) Machines of the type wherein there is a constant flow of liquid into the receptacle with a constant efflux of liquid therefrom.
(1) Note. Where the only liquid supply and efflux is due to a closed circulating system, it is not in this and the indented subclass, but in subclass 175 or other appropriate indented subclasses, particularly subclasses 184+ for pump circulating systems, subclass 190 for surgers, and subclasses 191 through 193 for systems where circulation is induced by heat.
