| 摘要 |
Paving slab for laying drains, consisting of artificial stone, concrete, a plastic/granite mixture or the like, the surface of which is divided into cuboid relief-like projections by dummy joints. The paving slab is characterised in that the cross-section of the rectangular slab (1) is of slightly conical or slightly frustoconical design to form a small channel-shaped recess (4) in the surface. <IMAGE>
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