The individual rotor discs being, one for each stage, on a common

Official title: {the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors}

F04D17/122 (The individual rotor discs being, one for each stage, on a common) appears on 522 US grants and 607 published applications in this corpus.