Teaching aid figure

Details Teaching aid figure Teaching aid figure

1978-01-05

1980-04-29

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D1907

Patent

active

D02548577

REFERENCES:
patent: D146296 (1947-02-01), Beder
patent: D233934 (1974-12-01), Drouin

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