| http://www.w3.org/ns/prov#value | - device comprises at least one spray nozzle (34, 35) mounted within a downwardly open cavity in the seat (18) and pivotable inwardly by means of a hydraulic or pneumatic actuating device comprising a piston-cylinder arrangement (58, 59), so that in its rest position said spraying device is located within the cavity and in its outwardly rotated position said spraying device is located off the cente
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