Office supplies; artists and teachers materials – Teaching material – Demonstrator or exhibitor
Patent
1981-08-31
1984-05-08
Feifer, Melvin B.
Office supplies; artists and teachers materials
Teaching material
Demonstrator or exhibitor
D21114
Patent
active
D02737973
REFERENCES:
patent: D154928 (1949-08-01), Kramer
patent: 4017986 (1977-04-01), Miller
Welch Physics and Chemistry Digest, Apr. 1955, p. 28, bottom, Model Room.
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