Mechanical pencil

Details Mechanical pencil Mechanical pencil

1999-04-16

2000-03-21

Holtje, Martie K.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Marking instrument

D19 55, D19 56, 1906

Patent

active

D04217721

REFERENCES:
patent: D228369 (1973-09-01), Longarzo
patent: D258219 (1981-02-01), Oka
patent: D280421 (1985-09-01), Giugiaro
patent: D363084 (1995-10-01), Hollington
patent: D368738 (1996-04-01), Osada et al.
patent: D375525 (1996-11-01), Boix Bacia
patent: D378762 (1997-04-01), Kikuchi et al.
patent: D405468 (1999-02-01), Izushima

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