| 摘要 |
<p>The brush is designed as wire bent into a u-shape, provided with bristles, and wound into a threaded segment to be joined to the front of a handle. The bristles are of different lengths, assembled into groups arranged around the wire. Short stretches of longer bristles (2b) alternate with longer stretches of shorter bristles (2a) forming steps (7) between them. The length of the longer bristles (2b) is reduced towards the tip, resulting in a conical outer contour.</p> |
