(under the class definition) Apparatus comprising a relatively fixed apparatus part against or in which an impeller* or its supporting shaft is intended to continuously move and (1) means to conduct to or retain between said fixed and continuously moving parts a friction reducing material (2) means to reduce or prevent undesired fluid flow into or out of the space between said fixed and continuously moving parts or (3) anti-friction fluid or solid means between said fixed and continuously moving parts to support said parts for relative movement.
(1) Note. Excluded under this definition is a mere nominal recitation of the various means; a specific recitation of a particular* means as defined above is necessary for classification in this subclass.
