Portable teaching aid

Details Portable teaching aid Portable teaching aid

1977-05-02

1979-08-28

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D19 52, D1907

Patent

active

D02527588

REFERENCES:
patent: 3345760 (1967-10-01), Myhr

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