| 摘要 |
A building block or panel having a shape of a parallelpiped including four edge faces (11, 13, 15 and 17) and two opposed major faces (19 and 21), the edge faces being formed to be interlockingly engageable with the edge faces on similar building blocks, each edge face including lateral zones which are located to one or the other side of the central longitudinal axis of the edge face, one zone of each edge face being formed with a recess (23) and the other zone of each edge face being of a complementary configuration to the one zone, the recesses on opposed edge faces being of corresponding configuration.
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