| 摘要 |
<p>The device has wall opening (3) that is surrounded by the housing (7) in which light shaft (8) of light-conducting and light-reflecting elements are installed. The emergency components (17a,17b) of the light shaft are provided with removable handgrips. The wall opening of the interior space is illuminated by light shaft according to installation of exit conductors (19) in the housing.</p> |
