with guiding tubes or tubular segments fixed to and surrounding the tips of the propeller blades, e.g. for supplementary mixing

Full Title

Mixers with rotary stirring devices in fixed receptacles (magnetic mixers B01F33/45); Kneaders > Stirrers > characterised by the configuration of the stirrers > Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller > with guiding tubes or tubular segments fixed to and surrounding the tips of the propeller blades, e.g. for supplementary mixing