| 摘要 |
<p>Appliance for use on top of the chair or seat of a person performing sedentary work and comprising an actual seat part (1), and under it a protrusion part (2) permitting movement of the appliance that is essentially unlimited in terms of direction. A device (3), particularly a spirit-level-type component (3) or an electronic attitude sensor, which shows the attitude of the appliance relative to the desired direction, is also attached to the appliance.</p> |
