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