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US 4,377,384 AGranted
Three-dimensional teaching device
OwnerDonald R. Williamsinventor
Life of this patent
Estimating the term…
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.
Claims2
In a three dimensional teaching device, comprising:
- (a) a stand, including a base and an upright;
- (b) a plurality of horizontally extending surfaced shelves, mounted fixedly to and extending from the left and right hand side, respectively of the upright;
- (c) a plurality of slides, respectively impressed with digits for vertical removable mounting on the surfaces of the shelves each of said shelves being capable of carrying more than one slide, in such a manner as to constitute, in combination with the shelves, on which they are mounted, a graphic presentation of a variety of mathematical problems and their solutions.
Dependencies are inferred from the claim text.