Office supplies; artists and teachers materials – Teaching material – Demonstrator or exhibitor
Patent
1975-09-29
1978-03-14
Feifer, Melvin B.
Office supplies; artists and teachers materials
Teaching material
Demonstrator or exhibitor
D1907
Patent
active
D02475030
REFERENCES:
patent: 3740854 (1973-06-01), Black
Feifer Melvin B.
Garrison David L.
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