| http://www.w3.org/ns/prov#value | - ged below the water level and defines an air chamber and also is held by means of a floating body, there is a pipe which is guided centrally relative to the nozzle body for guiding air and is securely connected with the nozzle body, the pipe has at least one air outlet opening in the area of the air chamber of the nozzle body, wherein in accordance with the present invention the pipe has a continu
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