{TAIL ~ This invention} relates to apparatus for machining workpieces to a predetermined contour in accordance with {HEAD ~ a reference pattern} 
{ TAIL ~ This invention } relates to apparatus for machining workpieces to a predetermined contour in accordance with { HEAD ~ a reference pattern }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD