Mechanical pencil

Details Mechanical pencil Mechanical pencil

1990-04-09

1992-03-31

Dunkins, Bruce W.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Marking instrument

D19 43, D19 56, D19 57

Patent

active

D03250458

REFERENCES:
patent: D120137 (1940-04-01), Most
patent: D145870 (1946-11-01), Green et al.
patent: D181145 (1957-10-01), Harper et al.
patent: D182311 (1958-03-01), Steinberg
patent: D188972 (1960-10-01), Young
patent: D189170 (1960-11-01), Lovejoy
patent: D189735 (1961-02-01), Platt
patent: D190263 (1961-05-01), Kaplan
patent: D279993 (1985-08-01), Oka
patent: D305551 (1990-01-01), Oka
patent: D319663 (1991-09-01), Katami
patent: 4917518 (1990-04-01), Chern

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