Means of milling whole cereal grains are well known and include {HEAD ~ the use} of hammer mills and {TAIL ~ roller mills} 
of
Means of milling whole cereal grains are well known and include { HEAD ~ the use } of hammer mills and { TAIL ~ roller mills }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL