| 摘要 |
This unit comprises an upper wall 6 smaller in area than the lower wall 7, side and rear walls perpendicular to the upper and lower walls and a sloping front wall 13. The upper 6 and lower 7 walls are fitted with additional means of hooking together 14 offset by a distance equal to the horizontal distance between the upper 10 and lower 12 edges of the front wall. <IMAGE>
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