(under subclass 95) Structures in which the ducts are formed by grooves or channels in plates.
(1) Note. See this class, subclass 101, for other removable wall conduits.
(2) Note. See Class 138, Pipes and Tubular Conduits,
subclasses 111+ particularly subclasses 115-117, for plural duct pipes and tubular conduits in which the ducts are formed by grooves or channels in plates.