Teaching aid

Details Teaching aid Teaching aid

1976-07-23

1977-08-23

Skogquist, Harland S.

35 31A, G09B 122

Patent

active

040430570

ABSTRACT:
An arithmetic teaching aid with a front and a back sheet of the same size and shape in superposed alignment. A spacing lug is disposed between the sheets at each of four corners thereof. A large disc and two series of smaller discs, each series comprising three smaller discs having equal diameters are rotatively disposed between the sheets and along a side edge of the sheets. The front sheet has openings through which numerical indicia on the discs is visible.

REFERENCES:
patent: 536526 (1895-03-01), Hooley
patent: 1985652 (1934-12-01), Campbell
patent: 2548553 (1951-04-01), Neves
patent: 2692444 (1954-10-01), Lindsley
patent: 2810211 (1957-10-01), Zesbaugh

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