| 摘要 |
It comprises a plurality of parallel equidistant operating zones exhibited by a gripping body 11. The operating zones are constituted by the rounded frontal faces 221 of teeth 241, 242, 243 of which the average surfaces 26 which are parallel, contained between the anterior faces 231, 232 and the posterior faces 191, 192 of the teeth, are inclined forwards with respect to the upper face 12 of the gripping body 11. <IMAGE>
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