Educational display unit

Details Educational display unit Educational display unit

1991-05-15

1995-11-21

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

Patent

active

D03644251

REFERENCES:
patent: 690446 (1902-01-01), Levy
patent: 3616943 (1971-11-01), Brink
patent: 3836217 (1974-07-01), Shuna
patent: 4883440 (1989-11-01), Bolli

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