Electric pencil sharpener

Details Electric pencil sharpener Electric pencil sharpener

1990-02-21

1992-03-17

Dunkins, Bruce W.

Office supplies; artists and teachers materials

Office equipment not elsewhere specified

Perforating or cutting

D19 65

Patent

active

D03247007

REFERENCES:
patent: D97522 (1935-11-01), Campbell
patent: D112801 (1939-01-01), Weiss
patent: D187767 (1960-04-01), Bacevius
patent: D221907 (1971-09-01), Kajiwara
patent: D226403 (1973-02-01), Rosson
patent: D250035 (1978-10-01), Kajiwara
patent: D251008 (1979-02-01), Kajiwara
patent: D298340 (1988-11-01), Yuen
patent: D320812 (1991-10-01), Yuen
patent: 716732 (1902-12-01), Mead
patent: 3059617 (1962-10-01), Swimmer et al.
patent: 4601316 (1986-07-01), Verdi

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