Mechanical means to facilitate changeable records

Claim 1

A display device for showing written information in a changeable manner to be viewed for reading or copying, said device comprising: a. a single plastic transparent flexible sheet having a planar surface lying in a first plane, b. a plurality of spaced elongated rectangular recesses formed along said sheet and from one side thereof, each extending substantially across the sheet, c. the plurality of elongated rectangular recesses are formed substantially parallel to each other and have a trapezoidal cross sections with enlarged flat bottom walls and inclined side walls sloping towards one another in a direction away from said bottom wall, d. said bottom walls of the elongated rectangular recesses normally lie in a second plane, e. elongated rectangular display strips, each being removably insertable into one of said elongated rectangular recesses, respectively, to matingly cooperate therein so as to lie substantially in flat engagement upon the bottom wall thereof by means of the coaction of the opposed side walls, and f. each of the display strips is viewable through one of the respective bottom walls in which it is insertable whereby said bottom wall forms a protective transparent layer over any written information contained on the said display strips.