| 摘要 |
<p>The device has a retainer (1) with fastening units, and an operating unit (3), which is movably held at a fastener. A frame shaped screen (4) is detachably connected with the retainer and surrounds the operating unit. The operating unit is provided with plain surface covered glass plates (5) as a contact surface at the front side. The front side of the glass plates is evenly formed.</p> |
