Electronic quiz unit for attachment to books

Details Electronic quiz unit for attachment to books Electronic quiz unit for attachment to books

1994-08-12

1995-11-28

Word, A. Hugo

Office supplies; artists and teachers materials

Teaching material

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

D17 1

Patent

active

D03646432

REFERENCES:
patent: D217876 (1970-06-01), Tong
patent: D269253 (1983-06-01), Yokoyama
patent: D349923 (1994-08-01), Billings et al.
patent: 2645970 (1953-07-01), Stabile
patent: 4884974 (1989-12-01), De Smet
patent: 5290190 (1994-03-01), McClanahan

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