FIGS 3 a c show {HEAD ~ a processing operation} being performed on a workpiece 4 in which, in contrast to the workpiece 4 shown in FIGS 2 a c, the formed shape does not project upwards but projects downwards beyond {TAIL ~ the support plane} 5 of the workpiece 4 
FIGS 3 a c show { HEAD ~ a processing operation } being performed on a workpiece 4 in which , in contrast to the workpiece 4 shown in FIGS 2 a c , the formed shape does not project upwards but projects downwards beyond { TAIL ~ the support plane } 5 of the workpiece 4
OTH OTH OTH OTH OTH HEAD 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH