| 摘要 |
<p>The boards (2) have rough faces, i.e. they are not planed on the wide surfaces (3) facing each other. On at least one of the visible narrow edges (8), steps are machined, forming upper and lower rebates (9, 10). Pairs of successive boards include a groove (11) of width (B) formed by the rebates. The groove sets-back (T) the resting edges of the boards, in an inward direction. Successive boards in the stack have the same, or differing widths. Optionally, between boards of greater width, several boards of lesser width are arranged.</p> |
