The mulching mower 10, 11 or 12, wherein {HEAD ~ lengths} of {TAIL ~ said upper and lower cutter blades} are equal 
of
The mulching mower 10 , 11 or 12 , wherein { HEAD ~ lengths } of { TAIL ~ said upper and lower cutter blades } are equal
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH