Multi-purpose learning device

Details Multi-purpose learning device Multi-purpose learning device

1989-02-06

1990-04-03

Grieb, William H.

Education and demonstration

Language

Spelling, phonics, word recognition, or sentence formation

434172, 434195, 434196, 434403, 446127, G09B 136, A63H 3308

Patent

active

049140191

ABSTRACT:
This invention deals with a multi-purpose learning device for mathematics, language, logic reasoning, and classification of objects.

REFERENCES:
patent: 1649578 (1927-11-01), Deming
patent: 1902136 (1933-03-01), Mills
patent: 2570625 (1951-10-01), Zimmerman et al.
patent: 3094792 (1963-06-01), Morgan et al.
patent: 3235975 (1966-02-01), Pierson
patent: 3728800 (1973-04-01), Magram
patent: 3818841 (1974-06-01), Tsurumi
patent: 4044476 (1977-08-01), Marsh
patent: 4822283 (1989-04-01), Roberts

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