| 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 ).
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