| 摘要 |
The two plates 2, 3 have a specific thickness E, each with a rectilinear slot 4, 5 which has a width 1 substantially greater than the thickness E, and it ends in an edge, the slot 4 of one 2 of the plates having a localized narrowing zone in a precise location 7 of a width which is slightly smaller than the thickness E of the other plate 3. <IMAGE>
|
