In state of the art tower design, it has been the practice to mount {HEAD ~ such ladder or cable tray segments} to supporting members such as {TAIL ~ structural I beams} or the like, which are themselves supported by the tower walls 
In state of the art tower design , it has been the practice to mount { HEAD ~ such ladder or cable tray segments } to supporting members such as { TAIL ~ structural I beams } or the like , which are themselves supported by the tower walls
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH