In the various installations shown in FIGS 18 to 25, the lengths of the covers may vary considerably, depending on {TAIL ~ the concepts} of {HEAD ~ the tooling} and stocking 
In the various installations shown in FIGS 18 to 25 , the lengths of the covers may vary considerably , depending on { TAIL ~ the concepts } of { HEAD ~ the tooling } and stocking
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 OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH