Mechanical pencil

Details Mechanical pencil Mechanical pencil

1990-04-09

1992-02-18

Dunkins, Bruce W.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Marking instrument

D19 41, D19 56

Patent

active

D03240703

REFERENCES:
patent: D124230 (1940-12-01), Dreyfuss
patent: D179053 (1956-10-01), Baker
patent: D220139 (1971-03-01), DiSpirito
patent: D253660 (1979-12-01), Carre
patent: D259642 (1981-06-01), Gomez
patent: D259793 (1981-07-01), Carre
patent: D279993 (1985-08-01), Oka
patent: D309633 (1990-07-01), Itoh
patent: D312838 (1990-12-01), Vitrac
patent: D316726 (1991-05-01), Itoh
patent: D319663 (1991-09-01), Katami
patent: 4973179 (1990-11-01), Nakazato et al.

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