Multi-purpose mathematical aid

Details Multi-purpose mathematical aid Multi-purpose mathematical aid

1974-03-01

1976-02-03

Grieb, Wm. H.

35 70, 35 72, 35 73, G09B 1902

Patent

active

039356493

ABSTRACT:
A multi-purpose mathematical aid designed to allow students, especially children, to see mathematical relationships by manipulation of materials. In its preferred form the mathematical aid comprises two moulded plates forming two halves of a storage case. Each plate has recessed square areas on one face for use with counting bars and catchment areas on the other face for use with disc or fractions of discs. The counting bars may, for example, be square or rectangular and may be adapted to rest in the recessed square areas.

REFERENCES:
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patent: 2502238 (1950-03-01), Wade et al.
patent: 2611193 (1952-09-01), Davis
patent: 3077677 (1963-02-01), Malkin et al.
patent: 3191318 (1965-06-01), Hoffmann
patent: 3410002 (1968-11-01), Mulholland et al.
patent: 3414343 (1968-12-01), Thomas
patent: 3414986 (1968-12-01), Stassen
patent: 3521383 (1970-07-01), Terwilleger
patent: 3624927 (1971-12-01), Sandlin
patent: 3797134 (1974-03-01), Wingerd

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