| 摘要 |
The two plates (2, 3) have a predetermined thickness (E), and each has a rectilinear slot (4, 5) having a width (l) substantially larger than the thickness (E) and which opens at one edge, the slot (4) of one of the plates (2) having a localized narrowing area (7) from its slightly smaller width to the thickness (E) of the other plate (3).
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