(1) Note. This subclass contains miscellaneous patents not otherwise classified, such as those for preventing the freezing in the pipes, charging distributing holders on trains, ships, etc.
(2) Note. For pipes or tubes, see Class 138, Pipes and Tubular Conduits, and for devices of general application for the prevention of fluid in pipes from freezing, see Class 138, subclasses 32+.
SEE OR SEARCH CLASS
137, Fluid Handling, particularly
561+, for fluid handling and distribution systems not otherwise provided for.
