(under subclass 322.16) Device wherein the container includes a cylindrical chamber having a piston which reciprocates within the chamber, and the component is located at, and functions between, the interface of an opening in an end wall
of the chamber and a shaft projecting from the piston through said opening.
SEE OR SEARCH CLASS
277, Seal for a Joint or Juncture, for a generic sealing means or process,
500+, for a dynamic, circumferential, contact seal for other than a piston.
