416 / | HD | FLUID REACTION SURFACES (I.E., IMPELLERS) |
179 | DF | ROTOR HAVING FLOW CONFINING OR DEFLECTING WEB, SHROUD OR CONTINUOUS PASSAGE {4} |
189 | DF | .~ Axially extending shroud ring or casing {4} |
190 | .~.~ Vibration inhibiting or expansion-contraction structure |