(under subclass 16) Apparatus comprising two or more working chambers, a surface portion of at least one of the chambers being movable to vary the voluminal space thereof.
(1) Note. Circumferentially spaced working chambers about a common working member are not considered plural working chambers under this definition and such devices are
classified on other features.
(2) Note. The plural chambers may be separated by a common intervening element having opposing surfaces each forming part of a respective chamber.
(3) Note. A separate working fluid may be used for each working chamber.
