| 摘要 |
A device has two units placed one on top of the other, each unit comprising a first side frame (101), a second side frame (102) spaced from the first side frame, and a band (130) running between the side frames (101, 102). Each unit (100, 200) has a pressure chamber (300) attached to the side frames (101, 102) and positioned in a sealed manner against the inner surface of the band (130). |
