| 摘要 |
The box has a bath forming a floor , opposite side walls (1, 1') and end face walls. One of these has a cutout which can be closed by a front viewing slide (5), the vertical sides of which run in the end wall. In the upper position, the slide is locked in a recess in the wall by a projection in the viewing slide. If the front viewing slide moves parallel to the end face wall, the projection or recess in it is directed towards the viewing slide and that of the viewing slide towards the end face wall
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