Music scale

Details Music scale Music scale

1982-06-24

1984-11-20

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D10 461

Patent

active

D02764431

REFERENCES:
patent: 763870 (1904-06-01), Finley
patent: 3592099 (1971-07-01), Gibby
patent: 3841192 (1974-10-01), Leonard
patent: 4305323 (1981-12-01), Graham

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