the amount of {HEAD ~ fabric} per unit volume of {TAIL ~ elastomer} is greater in said tooth bottoms than in said tooth portions 
the amount of { HEAD ~ fabric } per unit volume of { TAIL ~ elastomer } is greater in said tooth bottoms than in said tooth portions
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH