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Claim 1

IN A BINDER OF THE CHARACTER DESCRIBED WHICH HAS A CHANNEL SHAPED BRACKET HAVING A PAIR OF UPSTANDING EARS CONNECTED BY A FLAT PLATE FOR SUPPORTING A CATALOG THEREON BETWEEN SAID EARS, AN ELONGATED CLAMPING WIRE PIVOTALLY SECURED AT ONE END THEREOF TO ONE OF SAID EARS AND BEING LONGER THAN THE DISTANCE BETWEEN SAID EARS, A HOOK ON THE SECOND END OF SAID WIRE ADAPTED TO REACH BEYOND SAID SECOND EAR, SAID SECOND EAR HAVING A SLOT FORMED THEREIN, SAID SLOT HAVING A NARROW PORTION FOR RECEIVING SAID HOOK END OF THE WIRE THERETHROUGH ONLY WITH ACCOMPANYING FORESHORTENING OF THE WIRE AND A WIDER PORTION, AND A LOCK DEVICE COMPRISING A RELATIVELY FLAT SEGMENT HAVING AN UPSTANDING FLANGE PORTION, SAID LOCK DEVICE BEING PIVOTALLY SECURED ON SAID PLATE NEXT ADJACENT SAID SLOT FOR MOVEMENT ON A PIVOT AXIS PERPENDICULAR TO THE PLANE OF SAID FLAT PLATE TO A LOCK POSITION WHERE SAID UPSTANDING FLANGE IS JUXTAPOSED SAID SECOND EAR AND SAID SLOT, AND SAID SEGMENT IS PARALLEL TO AND IN CONTACT WITH SAID FLAT PLATE, SAID UPSTANDING FLANGE BEING OF A HEIGHT TO EXTEND FROM SAID FLAT PLATE TO SUBSTANTIALLY COVER SAID WIDER PORTION OF SAID SLOT AND SUBTEND SAID WIRE WHEREBY TO PREVENT FORESHORTENING OF THE WIRE, SAID LOCK DEVICE BEING PIVOTED TO A RELEASE POSITION WITH THE LOCK OFFSET FROM SAID FLAT PLATE AND SAID SLOT TO PERMIT THE CLAMPING WIRE TO BE RELEASED FROM SAID SECOND EAR BY A FORESHORTENING MOVEMENT OF SAID WIRE.