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