Keyboard training device

Details Keyboard training device Keyboard training device

1997-05-20

1998-06-23

Thompson, Martie

Office supplies; artists and teachers materials

Teaching material

D18 12, 1907

Patent

active

D03954501

REFERENCES:
patent: D267420 (1982-12-01), Malachowsky
patent: D300040 (1989-02-01), Dermody
patent: 1377070 (1921-05-01), Helguera
patent: 3229800 (1966-01-01), Krag
patent: 4075465 (1978-02-01), Funk et al.
patent: 4902231 (1990-02-01), Freer

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