Office supplies; artists and teachers materials – Teaching material – Demonstrator or exhibitor
Patent
1977-01-31
1978-10-24
Feifer, Melvin B.
Office supplies; artists and teachers materials
Teaching material
Demonstrator or exhibitor
D1907
Patent
active
D02500345
REFERENCES:
patent: 2572656 (1951-10-01), Ortenburger
patent: 3225459 (1965-12-01), Wilstein
patent: 3392461 (1968-07-01), Jenison
Epstein Saul
Feifer Melvin B.
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