| 摘要 |
<p>Soft surface coat is on at least one hard lower layer, the layers are bound together. A first cut is made through the soft coat to its boundary with the hard layer, which is cut through by a second cut along a line far enough from one of the faces of the 1st cut for the deformation of the hard layer not to extend up to the bonding zone with the soft coat, when the 2nd cut is made. Apparatus is described.</p> |
