(under subclass 68.1) Structures pertaining to conduits of the single duct type.
(1) Note. For the line between the subject matter in this
subclass and the structures in Class 138, Pipes and Tubular Conduits, see (8) Note to the main definitions of this class (174).
(2) Note. This subclass does not provide for single duct conduits having a removable wall. For such subject matter see subclass 101 of this class (174).
(3) Note. See this class, class definition (9) to (13) Notes for a list of classes having conduits combined with the subject matter thereof.
SEE OR SEARCH THIS CLASS, SUBCLASS:
24, for conduits in combination with a fluid or having means particularly adapted for use in connection with a fluid.
47, for a combined fluid conduit and an electrical conductor. 48, and 49, for wall mounted conduits.
95, and indented subclasses for conduits having plural channels or ducts.
