Three-dimensional teaching device

Details Three-dimensional teaching device Three-dimensional teaching device

1981-05-26

1983-03-22

Grieb, William H.

Education and demonstration

Mathematics

Arithmetic

434190, 40607, 108108, G09B 114, G09B 1902

Patent

active

043773842

ABSTRACT:
A three-dimensional device for teaching mathematical problems, comprising a stand having a number of open-ended shelves extending therefrom, the surfaces of said shelves being adapted to removably and interchangeably receive slides carrying different digits to set-up various mathematical problems, as conventionally done by paper and pen.

REFERENCES:
patent: 1273397 (1918-07-01), Neill
patent: 2722754 (1955-11-01), Slote
patent: 2802291 (1957-08-01), Bach et al.
patent: 3081718 (1963-03-01), Shoffner
patent: 3966056 (1976-06-01), Larson

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