1977-04-26
1978-08-08
Skogquist, Harland S.
35 77, 40518, G09B 120
Patent
active
041048105
ABSTRACT:
A display device suitable for illustrating a plurality of interior design schemes or for use as a teaching aid, the device including a case having at least two pairs of spools rotatable therein either manually or semi-automatically, there being a roll of material wound upon each of said pairs of spools, one of said rolls bearing alternative illustrations separated by transparent portions and the other of said rolls bearing a plurality of illustrations complimentary to the illustrations on said one roll, a window in a wall of said case through which the illustrations on the rolls may be viewed, the arrangement being such that by adjusting the spools an illustration made up from the complimentary illustrations on the two rolls can be viewed through the window. A magnetic strip located on one side edge of the case cooperates with magnetically attractable disc members to prevent inadvertent rotation.
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patent: 3000560 (1961-09-01), Clancy
patent: 3316668 (1967-05-01), Rogers
patent: 3451152 (1969-06-01), White
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