(under subclass 437) Apparatus in which a wall portion of the expansible chamber is fabricated of flexible material or rigid members hinged or interfitted together so that the members are movable relative to each other, the flexing of the material or the relative movement of the members constituting the movement which expands and contracts the chamber and the means for controlling flow into or out of said chamber being located on or supported by said wall portion.
SEE OR SEARCH THIS CLASS, SUBCLASS:
472+, for bellows-type pumping members which may have valve means supported on a movable portion thereof.
