This tray 15 comprises a well 45 for holding markers and the like, and upstanding therefrom {HEAD ~ a pair} of {TAIL ~ spaced apart flanges} 46 and 47 dimensioned for entry into the channel 41 of the extrusion 37 
of
This tray 15 comprises a well 45 for holding markers and the like , and upstanding therefrom { HEAD ~ a pair } of { TAIL ~ spaced apart flanges } 46 and 47 dimensioned for entry into the channel 41 of the extrusion 37
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH