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