{HEAD ~ This displaceable frame member} 17 is interconnected at {TAIL ~ opposed ends} thereof on a support guide block 37 which is secured to a respective one of opposed parallel guide rods 40 and displaced thereon by drive means in the form of a link belt 41 driven by suitable motor means  
is interconnected at
{ HEAD ~ This displaceable frame member } 17 is interconnected at { TAIL ~ opposed ends } thereof on a support guide block 37 which is secured to a respective one of opposed parallel guide rods 40 and displaced thereon by drive means in the form of a link belt 41 driven by suitable motor means
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH