US PATENT SUBCLASS 432 / 89
Current as of: June, 1999
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(under the class definition) Apparatus including means whereby a mode or condition of operation or use can be changed by shifting or rearranging all or some of the parts in a different relationship to each other or by addition or omission of a part.
(1) Note. The mode of operation is not considered to be charged by the operation of a selector or reversing valve means acting in its intended manner to select the direction of flow in a work chamber.