Puzzle for teaching

Details Puzzle for teaching Puzzle for teaching

1992-12-04

1994-09-20

Burke, Wasllace R.

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D21104

Patent

active

D03507726

REFERENCES:
patent: D8466 (1875-07-01), Lyman
patent: D91126 (1933-11-01), Thompson
patent: D163085 (1951-05-01), Bishop
patent: D219917 (1971-02-01), Skinner
patent: D235673 (1975-07-01), Root
patent: D316730 (1991-05-01), Yoshida
patent: D320242 (1991-09-01), Slayton
patent: 3903617 (1975-09-01), Evans

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