| 摘要 |
The cutter has a blade (4) which is planar and has a grooved edge (6). The cutter has at least one stable position on a flat support (25), all the other positions of knife on the support being unstable. The cutter has a shape and a mass distribution such that, in each stable position, the blade (4) is angled with respect to the support and the grooved edge is in contact with the support. The cutter can be shaped so that, at least in each position adjacent to the stable position, the blade has a contact point (27) with the support.
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