Acoustic feedback learning aid

Details Acoustic feedback learning aid Acoustic feedback learning aid

2008-04-01

2008-04-01

Delehanty, Robert A. (Department: 2914)

Office supplies; artists and teachers materials

Teaching material

Sensory feedback, e.g., audio-visual teaching machine

Design Patent

active

29267825

CLAIM:
The ornamental design for acoustic feedback learning aid, as shown and described.

REFERENCES:
patent: D261669 (1981-11-01), Tran et al.
patent: D287145 (1986-12-01), Shilton et al.
patent: D318306 (1991-07-01), Cheung
patent: D406867 (1999-03-01), Wise et al.
patent: D410046 (1999-05-01), Fletcher
patent: D420404 (2000-02-01), Yiu
patent: D420405 (2000-02-01), Plain et al.
patent: D453793 (2002-02-01), Hou
patent: D473203 (2003-04-01), Enos et al.

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