Learning tree

Details Learning tree Learning tree

1985-08-12

1988-04-05

Ansher, Bernard

Office supplies; artists and teachers materials

Teaching material

D 6301, D21 25

Patent

active

D02950545

REFERENCES:
patent: D199464 (1964-10-01), Riddle
patent: D251647 (1979-04-01), Valien
patent: D270882 (1983-10-01), Wilson
patent: D276055 (1984-10-01), Guertin
patent: 2902776 (1959-09-01), Butler
patent: 3564732 (1971-02-01), Lynd
patent: 4375288 (1983-03-01), Guertin

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