Educational aide for teaching physical properties of light

Details Educational aide for teaching physical properties of light Educational aide for teaching physical properties of light

1975-01-28

1976-12-21

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D1907

Patent

active

D02427931

REFERENCES:
patent: 2155114 (1939-04-01), Black

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