| 摘要 |
A propulsion or pumping device which includes two counter-rotating shafts (3, 4) each carrying at least one impeller (7, 8), wherein each impeller (7 , 8) can deflect by a predetermined amount in directions substantially perpe ndicular t to the longitudinal axis of the shaft (3, 4) on which the impelle r (7, 8) is mounted.
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