(under subclass 36) Subject matter wherein a cylindrical or cup shaped expansible chamber has side walls comprising sections of alternately larger and smaller cross-sections which make up a single fluid or gas chamber having a zigzag or pleated wall, or wherein an expansible chamber device includes a plurality of movable walls, two or more of which are of the flexible sheet material or diaphragm type whereby vertical collapse or expansion of the chamber is facilitated.
SEE OR SEARCH CLASS
137, Fluid Handling,
786, and 793+ for expansible chamber fluid handling devices of the bellows or capsule type.
