| http://www.w3.org/ns/prov#value | - According to a modified enbodiment which is not shown in the drawing, the scraper edge of oxide ceramics 20 can rest on a step in the scraper blade 6 and/or can have at least two point-like elevations or recesses such as springs or grooves running in a longitudinal direction which fit into corresponding recesses or projections in the scraper blade 6.
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