Education device

Details Education device Education device

1986-02-24

1987-06-23

Grieb, William H.

Education and demonstration

Mathematics

40450, 434160, G09B 140

Patent

active

046749829

ABSTRACT:
Blocks of three different shapes can be detachably secured to a supporting surface such as a board and can form numbers from 0 to 9 inclusive in digital format.

REFERENCES:
patent: 713638 (1902-11-01), Hepfinger
patent: 2611193 (1952-09-01), Davis
patent: 4220948 (1980-09-01), Trame
patent: 4539768 (1985-09-01), Halliday

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