| 摘要 |
Provided inside the nozzle is a brush plate (4) which can be adjusted in height and to which a brush (5) is fixedly attached. Provided to actuate the brush plate (4) are two foot levers (7,8) which are connected to eccentrics (10) which rest in sloping depressions (11) in the brush plate (4). The movement of the brush plate (4) is thus facilitated. <IMAGE>
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