.~ Oppositely movable walls of common chamber (69) (75)
DEFINITION
Classification: 92/50
(under subclass 48) Apparatus in which the working members form opposite walls of a chamber which is adapted to contain the working fluid, said working members being movable toward and away from each other during the contraction and expansion of the expansible chamber device.
(1) Note. A unitary bag-like flexible wall working member is excluded from this subclass, such subject matter is classified below as indicated in the Search Notes.
SEE OR SEARCH THIS CLASS, SUBCLASS:
69, and 75, for plural relatively movable working members of the nonflexible wall type forming opposite walls of a common chamber.
