Indicator for classroom control and education

Details Indicator for classroom control and education Indicator for classroom control and education

1979-10-04

1982-06-22

Lee, Lester L.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D19 59, D19 62, D1907

Patent

active

D02651009

REFERENCES:
patent: 2854765 (1958-10-01), Rickless
patent: 3304627 (1967-02-01), Cella
patent: 3685170 (1972-08-01), Fairleigh
patent: 3769720 (1973-11-01), Terrones

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