| 摘要 |
The tiles define a succession of vaults on which protrude fingers or piles. One side of each plate has eyelets at the top of the vaults while the other side forms lugs able to be slidably engaged under the vaults of the contiguous tile. The plates are besides provided, on one of their end edges, with protruding rings corresponding to mating tongues formed beneath the opposite edge of a contiguous tile.
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