The feed mixer apparatus 6 wherein {TAIL ~ said first auger} includes a first set of {HEAD ~ knives} 
The feed mixer apparatus 6 wherein { TAIL ~ said first auger } includes a first set of { HEAD ~ knives }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD