Educational instrument for numbers

Details Educational instrument for numbers Educational instrument for numbers

1999-12-03

2000-06-27

Hafer, Robert A.

Education and demonstration

Mathematics

Arithmetic

434188, 434191, 434202, 434199, 273157R, 40488, 40491, G09B 100, G09B 1900

Patent

active

060799838

ABSTRACT:
An educational instrument for numbers for providing students with an educational tool that would be fun and challenging. The educational instrument for numbers includes a base member having a top side, a recessed portion in the top side, a first longitudinal slot, a second longitudinal slot, a first longitudinal groove extending from the recessed portion and terminating near a first end of the base member, a second longitudinal groove extending from the recessed portion and terminating near a second end of the base member, a matrix of numbers disposed in the recessed portion, a first cover means slidably disposed in the first longitudinal slot and movable over the recessed portion, and a second cover means slidably disposed in the second longitudinal slot and movable over the recessed portion and over the first cover member.

REFERENCES:
patent: 1155523 (1915-11-01), Smith
patent: 1527663 (1925-02-01), Berry
patent: 1720812 (1929-07-01), Zim
patent: 2656618 (1953-10-01), Pescatori
patent: 3009262 (1961-11-01), Moran
patent: 3735504 (1973-05-01), Fedyna
patent: 4445865 (1984-05-01), Sellon

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