Office supplies; artists and teachers materials – Teaching material – Demonstrator or exhibitor
Patent
1988-07-27
1991-07-30
Burke, Wallace R.
Office supplies; artists and teachers materials
Teaching material
Demonstrator or exhibitor
Patent
active
D03186890
REFERENCES:
patent: D208912 (1967-10-01), Siptrott
patent: D309165 (1990-07-01), Kaplan et al.
patent: 3998003 (1976-12-01), Rosenbaum
Flexo-hedron teaching device, Uni-Art, 1/25/77.
Burke Wallace R.
Interel, Inc.
Schmidt Pamela
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