The combination support structure 1 wherein roller means are provided about two sides of said combination support structure for allowing the latter to be moved along {HEAD ~ either side} having said {TAIL ~ roller} means thereon 
having
The combination support structure 1 wherein roller means are provided about two sides of said combination support structure for allowing the latter to be moved along { HEAD ~ either side } having said { TAIL ~ roller } means thereon
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 HEAD HEAD HEAD HEAD HEAD HEAD REL OTH TAIL TAIL TAIL TAIL TAIL OTH OTH