Demonstration device

Details Demonstration device Demonstration device

1984-11-13

1987-11-24

Ansher, Bernard

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

434272

Patent

active

D02929325

REFERENCES:
patent: D216364 (1969-12-01), Benz
patent: 3579858 (1971-05-01), Bentov
patent: 3775865 (1973-12-01), Rowan
patent: 4058910 (1977-11-01), Funk

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