A first conduit means is provided within the housing for receiving a first flow of fluid from the plenum chamber and for directing the first fluid flow out of the housing for impingement upon the material to pick up and remove {HEAD ~ dust} and cuttings from {TAIL ~ the vicinity} of the cutting cone 
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A first conduit means is provided within the housing for receiving a first flow of fluid from the plenum chamber and for directing the first fluid flow out of the housing for impingement upon the material to pick up and remove { HEAD ~ dust } and cuttings from { TAIL ~ the vicinity } of the cutting cone
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