Talking phonics interactive learning device

Office supplies; artists and teachers materials – Teaching material – Sensory feedback – e.g. – audio-visual teaching machine

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D14100

Patent

active

D03700275

REFERENCES:
patent: D280217 (1985-08-01), Tomozawa et al.
patent: D318069 (1991-07-01), Cheung et al.
patent: D345377 (1994-03-01), Poon
patent: D349691 (1994-08-01), Takeichi et al.
patent: 4421487 (1983-12-01), Laughon et al.
patent: 4639225 (1987-01-01), Washizuka

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