| 摘要 |
<p>The tray has a stagger formed in its perimeter at its median point. In the upper half of its side two location cut-out points are provided having a specific width. In the lower half, corresponding lugs or protrusions are provided which also have a specific width. In the area where the two trays engage (2), the trays are provided with an area formed from inclined planes. This acts to centre the upper tray as it is positioned above the lower tray. This feature allows the trays to be formed into piles or slid prior to being engaged one into the other.</p> |
