Question and answer cube

Details Question and answer cube Question and answer cube

1985-08-05

1988-03-15

Ansher, Bernard

Office supplies; artists and teachers materials

Teaching material

D19 62, D19 64

Patent

active

D02947145

REFERENCES:
patent: D255473 (1980-06-01), Chase et al.
patent: D262892 (1982-02-01), Heiko
patent: 2788976 (1957-04-01), Bascle, Jr.
patent: 3969973 (1976-07-01), Pandapas, Jr.
patent: 4568086 (1986-02-01), Krogh

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