| http://www.w3.org/ns/prov#value | - rality of adjustable elements for supporting and for adjusting said main casing part and said cover part with respect to the plane of rotation of the blades so as to provide clearance around the blades after the impeller has been fixed in position, and means including an opening in the main casing part communicating with the rearward side of the impeller for admitting a fluid under pressure to sai
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