Reusable learning aid

Details Reusable learning aid Reusable learning aid

1989-09-01

1990-11-06

Apley, Richard J.

Education and demonstration

Means for demonstrating apparatus, product, or surface...

Transparent means permitting interior view

434365, 434408, G09B 1900

Patent

active

049682580

ABSTRACT:
A learning aid permitting the student to insert a worksheet into a rigid body having space between two planes. One of the plaens is clear permitting the instructor to mark on it, performing the work demanded by the underlying worksheet. The instructor's marking is erased and the student attempts the same task. The work sheet is secured in place either by (i) its natural mechanical tension with the two planes, or (ii) by an insert mechanism securing the paper either through electrical attraction or by a mechanical clip.

REFERENCES:
patent: 1757287 (1930-05-01), Bildstein
patent: 2586017 (1952-02-01), Freedman
patent: 2608771 (1952-09-01), Sparks
patent: 2791040 (1957-05-01), Santorelli
patent: 3092400 (1963-06-01), Smith
patent: 3206225 (1965-09-01), Oleson
patent: 3252462 (1966-05-01), Quarton et al.
patent: 3553864 (1971-01-01), Karlyn et al.
patent: 3642191 (1972-02-01), Roof
patent: 3838520 (1974-10-01), Quenot
patent: 4427391 (1984-01-01), Berman
patent: 4741119 (1988-05-01), Baryla

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