Educational word forming unit

Details Educational word forming unit Educational word forming unit

1991-05-16

1993-03-23

Burke, Wallace R.

Office supplies; artists and teachers materials

Teaching material

Patent

active

D03342115

REFERENCES:
patent: 239385 (1881-03-01), Irwin
patent: D308698 (1990-06-01), Dorman
patent: 3302311 (1967-02-01), Israel
patent: 3514876 (1970-06-01), Sellers
patent: 3550310 (1970-12-01), Bock-Greissau
patent: 3628261 (1971-12-01), Thompson
patent: 3667760 (1972-06-01), Nelson
patent: 4651992 (1987-03-01), Danino
patent: 4960382 (1990-10-01), Alford
patent: 5018728 (1991-05-01), Lisa

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