(under the class definition) Structure including either (a) a retaining means actuated by fluid pressure responsive means or (b) means forming a distinct fluid pressure chamber to balance fluid pressure forces at plural points in the joint assembly.
SEE OR SEARCH CLASS
277, Seal for a Joint or Juncture, for a generic sealing means or process,
926, for a seal having means to create a fluid pressure equilibrium at a joint or juncture.
