Music teaching aid

Details Music teaching aid Music teaching aid

1976-03-31

1978-01-31

Feifer, Melvin B.

Office supplies; artists and teachers materials

Teaching material

D1907

Patent

active

D02471191

REFERENCES:
patent: 347686 (1886-08-01), Carpenter et al.
patent: 718065 (1903-01-01), Woods
patent: 2564616 (1951-08-01), Telasco

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