A fastener advancing means intermittently urges {HEAD ~ the strip} of {TAIL ~ fasteners} toward a drive element  
of
A fastener advancing means intermittently urges { HEAD ~ the strip } of { TAIL ~ fasteners } toward a drive element
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH