| 摘要 |
<p>The invention relates to a handheld implement (1) having an active part (15) vibrating at a frequency of at least 20 kHz with an amplitude of at least 10 mgr;m and up to 100 mgr;m, characterized in that the implement (1) has at least two configurations, a first configuration where the active part (15) is hard, and a second configuration where the active part (15) is not hard.</p> |
