| 摘要 |
<p>Pressed concrete paving stones may be internested, owing to the shapes thereof, for covering grounds subjected to important strains. Their shapes are comprised of an upper part (1) configured as a semi-ellipse and of a lower part (2), consisting of 3 portions of that same ellipse. Said paving stone has the characteristic of absorbing important stress without break or wear. The principle according to the invention is particularly intended to landscape-gardeners and to road works contractors.</p> |
