(under the class definition) Apparatus including means for providing a jet stream of motive fluid and a receiving orifice to receive all or a portion of the jet stream, motive
fluid being conducted from the orifice to a working chamber of the motor to cause operation thereof, movement of the motor being controlled by varying the proportion of the jet stream which enters the orifice.
SEE OR SEARCH CLASS
137, Fluid Handling,
83, for jet control type pressure modulating relays or followers, per se.
