US PATENT SUBCLASS 91 / 173
.~ One working member forms movable chamber for another

Current as of: June, 1999
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91 /   HD   MOTORS: EXPANSIBLE CHAMBER TYPE

170 R  DF  RELATIVELY MOVABLE WORKING MEMBERS WITH ONE HAVING MOTIVE FLUID CONTROLLED BY, MOVABLY INTERCONNECTED WITH OR MOVED BY ANOTHER {12}
173.~ One working member forms movable chamber for another

DEFINITION

Classification: 91/173

(under subclass 170) Apparatus comprising a working chamber carried by and movable with a first working member, and a second working member movable within the working chamber carried by the first working member.

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167+, for a motor having a unit having separately controlled working chambers, the extension of which is equal to the individual chamber extensions.

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73, Measuring and Testing,

240, for expansible chamber volume or rate of flow meters having a transversely reciprocating piston and cylinder.