Office supplies; artists and teachers materials – Teaching material – Demonstrator or exhibitor
Patent
1982-04-21
1985-05-14
Feifer, Melvin B.
Office supplies; artists and teachers materials
Teaching material
Demonstrator or exhibitor
D21108
Patent
active
D02788349
REFERENCES:
patent: 3284926 (1966-11-01), Godfrey
patent: 4325698 (1982-04-01), Darling et al.
Orbit Molecular Building System, 1971, p. 2, FIG. 1.
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