{HEAD ~ One flange} 46 has a depending lip 48 and the other flange 47 has an upstanding rib 49 to seat within the channel flanges 40 securing the tray from {TAIL ~ downward movement} 
{ HEAD ~ One flange } 46 has a depending lip 48 and the other flange 47 has an upstanding rib 49 to seat within the channel flanges 40 securing the tray from { TAIL ~ downward movement }
HEAD HEAD HEAD HEAD HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL TAIL