{TAIL ~ a counter tool} placed in {HEAD ~ opposition} to the sonotrode to define a gap there between for passage of the material web 
{ TAIL ~ a counter tool } placed in { HEAD ~ opposition } to the sonotrode to define a gap there between for passage of the material web
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH