| 摘要 |
<p>The device (1) has an elongated propelable maintenance body (9) provided with burl-like projections. One of the projections exhibits a measure exceeding largest foot dimension over separate length or corresponds to a foot dimension in two directions perpendicular to each other, running transverse to a radial extension and provided in a common plane. The projections are provided on an axial length of the maintenance body by 50 mm, where the projections are formed by a plastic hollow body.</p> |
