Office supplies; artists and teachers materials – Teaching material – Demonstrator or exhibitor
Patent
1978-01-11
1980-04-22
Feifer, Melvin B.
Office supplies; artists and teachers materials
Teaching material
Demonstrator or exhibitor
D 7157, D1907
Patent
active
D02547937
REFERENCES:
patent: 454165 (1891-06-01), Dennison
patent: 1977244 (1934-10-01), Putnam et al.
patent: 2700228 (1955-11-01), Fainman
patent: 3133976 (1964-05-01), Gross
patent: 3215409 (1965-11-01), Purciello
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