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Claim 1

DISPLAY UNIT COMPRISING AN OUTER BINDER, AN INNER BINDER, EACH SAID BINDER COMPRISING A PAIR OF RECTANGULAR PANELS HAVING END EDGES OF THE SAME WIDTH AND SIDE EDGES OF THE SAME LENGTH AND HINGEDLY CONNECTED TO EACH OTHER ALONG RESPECTIVE ADJACENT ENDS EDGES, THE REMAINING END EDGES OF SAID PANELS OF SAID INNER BINDER BEING HINGEDLY CONNECTED TO THE RESPECTIVE PANELS OF SAID OUTER BINDER, ALL OF THE HINGE CONNECTIONS BEING PARALLEL TO EACH OTHER, SAID BINDERS BEING FOLDABLE ON THEIR HINGE CONNECTIONS TO CLOSED CONDITION IN WHICH THE PANELS ARE ALL PARALLEL TO EACH OTHER WITH THE HINGE CONNECTION BEWEEN THE ADJACENT EDGES OF THE RESPECTIVE INNER BINDER PANELS PROXIMATE TO THE HINGE CONNECTION BETWEEN THE ADJACENT EDGES OF THE RESPECTIVE OUTER BINDER PANELS AND WITH THE INNER BINDER PANELS BETWEEN THE OUTER BINDER PANELS, SAID BINDERS BEING FURTHER FOLDABLE ON THEIR HINGE CONNECTIONS TO DISPLAY CONDITION IN WHICH SUCCESSIVE PANELS, ARE GENERALLY PERPENDICULAR TO EACH OTHER AND EACH INNER BINDER PANEL IS PARALLEL TO THE OUTER BINDER PANEL OTHER THAN THE ONE TO WHICH IT IS HINGEDLY CONNECTED, MEANS FOR RELEASABLY MAINTAINING SAID BINDERS IN THEIR DISPLAY CONDITION, AND MEANS FOR MOUNTING DISPLAY SHEETS ON SAID INNER BINDER WITHIN SAID SHEET TURNABLY ATTACHED ADJACENT AN EDGE THEREOF TO SAID INNER BINDER AT THE HINGE CONNECTION OF SAID INNER BINDER PANELS SO THAT SAID SHEETS MAY BE TURNED TO OVERLIE BOTH OF SAID INNER BINDER PANELS.