Electronic learning apparatus

Details Electronic learning apparatus Electronic learning apparatus

1998-10-02

2000-08-01

Nunn, Freda

Office supplies; artists and teachers materials

Teaching material

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

D14106, D19 59, 1907

Patent

active

D0428920&

REFERENCES:
patent: D308510 (1990-06-01), Cheung
patent: D310071 (1990-08-01), Kit
patent: D330048 (1992-10-01), Cheung et al.
patent: D358171 (1995-05-01), Cheng

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