| 摘要 |
Two opposing sets of combs (4,5) have different configurations. One set of combs are wide with narrow passages (8) between them, and the other set has combs the width of the passages in the first set and passages (3) the width of the first combs. - The combs or ribs are at least on one surface (2) shorter than the width of the block. In at least one of the vertical block corner edges, there can be a recess (9). |
