A tray housing driving mechanism 18, further comprising {HEAD ~ a switch} engaging {TAIL ~ said first drawer} to terminate movement at an extreme limit of movement of said first drawer 
A tray housing driving mechanism 18 , further comprising { HEAD ~ a switch } engaging { TAIL ~ said first drawer } to terminate movement at an extreme limit of movement of said first drawer
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