| 摘要 |
<p>The blackboard arrangement (1) has a blackboard (2) and a projector (3), during which the blackboard and the projector are movably arranged and guided along a direction. A detachable coupling device is provided for coupling the movement of the blackboard and the projector. The blackboard and the projector are movable in coupled condition of the detachable coupling device in only combined manner. The blackboard is separately moved in decoupled condition of the coupling device.</p> |
