| 摘要 |
<p>A scraper for removing calcareous growths, anemones, mussels, sea-weeds, algae, etc. on flat or arched surfaces, which is formed by a motor-driven disk (1) with a number radial knives (2) distributed over the circumference thereof, with a structure allowing bending or deflecting along at least two planes, namely that lengthwise symmetry plane the knife extends in and a plane at right angle thereto and in parallel relationship with the geometrical axis of said disk (1).</p> |
