For example, several fastening machines are mounted on a common frame above a surface conveyor which carries a work product underneath the fastening machines, and triggering devices responsive to the movement of the work product to a predetermined position actuate {HEAD ~ the fastening machines} which drive {TAIL ~ fasteners} into the work product 
drive
For example , several fastening machines are mounted on a common frame above a surface conveyor which carries a work product underneath the fastening machines , and triggering devices responsive to the movement of the work product to a predetermined position actuate { HEAD ~ the fastening machines } which drive { TAIL ~ fasteners } into the work product
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH