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