This valve assures that {TAIL ~ the extension shaft} 60 of pneumatic cylinder 20 has been completely extended while the extension shafts 35 and 35 of both pneumatic cylinders 19, and 19 on the outside surfaces of {HEAD ~ cam plates} 37 have been completely retracted before drive element 14 begins its travel downward toward the frontmost staple 
This valve assures that { TAIL ~ the extension shaft } 60 of pneumatic cylinder 20 has been completely extended while the extension shafts 35 and 35 of both pneumatic cylinders 19 , and 19 on the outside surfaces of { HEAD ~ cam plates } 37 have been completely retracted before drive element 14 begins its travel downward toward the frontmost staple
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH