Visual aid and display device

Details Visual aid and display device Visual aid and display device

1978-01-16

1979-06-05

Grieb, William H.

40427, G09B 100

Patent

active

041569750

ABSTRACT:
A visual aid and display device is disclosed in which a central axis has mounted thereon a nest of vanes of varying length which are sheet-like members longer in length than width and concaved toward the central axis and each of which is connected to the axis at both of its ends. The vanes may be any of a number of geometrical shapes and may carry a limitless variety of visual displays on their surfaces.

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patent: 3594924 (1971-07-01), Baker
patent: 4008534 (1977-02-01), Swartz

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