cooperating means on each of said display cases for retaining adjacent display cases releasably in vertically stacked relation for pivotal movement of their front and rear compartments as {HEAD ~ units} about {TAIL ~ a common vertical axis}, and 
about
cooperating means on each of said display cases for retaining adjacent display cases releasably in vertically stacked relation for pivotal movement of their front and rear compartments as { HEAD ~ units } about { TAIL ~ a common vertical axis } , and
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 OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH