| http://www.w3.org/ns/prov#value | - The fastening portions 6 of the mixing elements 3 are as it were inserted through the perforations 5 located in the wall of the rotary tube 1 and project or protrude a little, in particular on the outside, so that an outside welding of the fastening portions 6 of the mixing elements 3 to the rotary tube 1 (that is to say, to the outer wall of the rotary tube 1) or to the reinforcing element 8 beco
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