In {HEAD ~ operation}, {TAIL ~ a workpiece} is placed between the base and the platen, and a force is applied to the workpiece by operation of the bellows 
In { HEAD ~ operation } , { TAIL ~ a workpiece } is placed between the base and the platen , and a force is applied to the workpiece by operation of the bellows
OTH HEAD HEAD HEAD HEAD HEAD OTH 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