applying {HEAD ~ a combination} of high frequency ultrasound waves and {TAIL ~ pressure} to the said pieces of fabric, so overlapped and folded, along the layers of overlap and fold 
of
applying { HEAD ~ a combination } of high frequency ultrasound waves and { TAIL ~ pressure } to the said pieces of fabric , so overlapped and folded , along the layers of overlap and fold
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH