Educational board and pieces therefor

Details Educational board and pieces therefor Educational board and pieces therefor

1996-03-05

1997-12-30

Lucas, Susan J.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D21 20, 1907

Patent

active

D03884619

REFERENCES:
patent: D235894 (1975-07-01), DiLorenzo
patent: 1682686 (1928-08-01), Rutherford
patent: 2191991 (1940-02-01), Lloyd
patent: 2757934 (1956-08-01), Dunbar
patent: 2889634 (1959-06-01), Bringmann
patent: 4201389 (1980-05-01), Vowell

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