an ultrasonic unit including a converter, {TAIL ~ a sonotrode} to act on a material web, and a booster to connect the sonotrode to {HEAD ~ the converter} 
an ultrasonic unit including a converter , { TAIL ~ a sonotrode } to act on a material web , and a booster to connect the sonotrode to { HEAD ~ the converter }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD