Educational apparatus

Details Educational apparatus Educational apparatus

1977-04-27

1978-03-14

Skogquist, Harland S.

40495, G09B 122

Patent

active

040783200

ABSTRACT:
At each of four spaced-apart locations between stiff sheet members two, but preferably three, discs are rotatably supported by pivot elements. The upper and lower discs have a smaller diameter than the disc between them whereby an annularly-shaped marginal face surface of a central disc is exposed. Each marginal face surface and the face surface of the smaller discs contain printed indicia which is selected by rotating the discs for positioning into an aligned relation with window openings cut into the sheet members. These window openings are, in turn, aligned with window openings in a selected one of a plurality of cover sheets. A peripheral edge segment of each disc extends outwardly beyond the edges of the sheet members.

REFERENCES:
patent: 1530404 (1925-03-01), Pearce
patent: 1728584 (1929-09-01), Wright
patent: 1833793 (1931-11-01), Pfleger
patent: 3200517 (1965-08-01), D'Agostino
patent: 3553867 (1971-01-01), Behren
patent: 4043055 (1977-08-01), Zegel

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