| 摘要 |
a. Prefabricated paving stone. b. Paving stone characterised in that one of the large sides AB, CD has an indentation M and the other has a protrusion P of complementary shape to that of the indentation and in that one of the small sides BC, AD, has an indentation Q and the other has a protrusion N whose shape is also complementary, the sum of the length of the indentation and of the protrusion of two complementary sides being equal to the length of the corresponding side, and the bottom surface of the paving stone comprises a cavity 2 of rounded shape. c. The invention relates to public works. <IMAGE>
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