Electronic detection unit for an educational instrument

Details Electronic detection unit for an educational instrument Electronic detection unit for an educational instrument

1984-03-29

1987-02-17

Zarfas, Louis S.

Office supplies; artists and teachers materials

Teaching material

D14116

Patent

active

D02883376

REFERENCES:
patent: D197178 (1963-12-01), Meuche
patent: D240606 (1976-07-01), Koenig
patent: D275956 (1984-10-01), Culp
patent: 4467196 (1984-08-01), Balliet et al.

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