(under the class definition) Subject matter relating to a pipe, duct, or channel for guiding the load as it travels through the fluid current conveyor*.
SEE OR SEARCH THIS CLASS, SUBCLASS:
86+, for a conduit having means for maintaining load material traveling therethrough in suspension.
SEE OR SEARCH CLASS
104, Railways,
138.1+, for tubular ways; and subclasses 154 and 155+ for fluid current propulsion railways.
138, Pipes and Tubular conduits, appropriate subclasses for conduits in general.
