Mechanical pencil

Details Mechanical pencil Mechanical pencil

1999-11-15

2000-08-29

Holtje, Martie K.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Marking instrument

D19 49, D19 53, D19 55, D19 56, 1906

Patent

active

D04302109

REFERENCES:
patent: D306317 (1990-02-01), Petterson
patent: D338915 (1993-08-01), Willat
patent: D345466 (1994-03-01), Brouse
patent: D400581 (1998-11-01), Hasegawa
patent: D403705 (1999-01-01), Izushima et al.
patent: D415197 (1999-10-01), Izushima
patent: D418871 (2000-01-01), Keda

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