Office supplies; artists and teachers materials – Teaching material – Demonstrator or exhibitor
Patent
1977-08-26
1981-03-17
Feifer, Melvin B.
Office supplies; artists and teachers materials
Teaching material
Demonstrator or exhibitor
D1907
Patent
active
D02585979
REFERENCES:
patent: 2882617 (1959-04-01), Godfrey
patent: 3524267 (1970-08-01), Barrett et al.
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