| 摘要 |
Self-powered appliance for surface treatment, comprising a movable framework 10 supported by feet 2 alternately resting on the surface 3 and moved parallel to the surface, the framework carrying instruments 7 for surface treatment, appliance characterised in that the feet 2 are combined in pairs, each foot of a pair pivoting at one end of a balance bar 1 driven by drive means 6 in angular movements of predetermined amplitude and direction, by pivoting about each of the feet 2a, 2b alternately resting on the surface 3. <IMAGE>
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