Signal indicator for educational use

Details Signal indicator for educational use Signal indicator for educational use

1991-04-10

1993-06-29

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

Sensory feedback, e.g., audio-visual teaching machine

D10116

Patent

active

D03369242

REFERENCES:
patent: D198082 (1964-04-01), Ward
patent: D199566 (1964-11-01), Wolfe, Sr.
patent: D225643 (1972-12-01), Harrison
patent: D289179 (1987-04-01), Musgrave
patent: D294714 (1988-03-01), Johnson
patent: D314214 (1991-01-01), Perdue
patent: D321010 (1991-10-01), Healy

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