| 摘要 |
A chamber (41) within which a rotor (1) is to be rotated is provided with a wall (5) encircling the rotor (1) when the rotor (1) is in position and generally coaxial with the axis of rotation of the rotor (1), whereby the wall (5) is pivotably mounted so that it can pivot about an axis (10) from an inoperative position permitting access to the rotor to an operative position encircling the rotor.
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