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