Mechanical pencil

Details Mechanical pencil Mechanical pencil

1997-09-23

1999-03-23

Holtje, Martie K.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Marking instrument

D19 51, D19 55, D19 56, D19 53, 1906

Patent

active

D04071140

REFERENCES:
patent: D113633 (1939-03-01), Kahn
patent: D169307 (1953-04-01), Ferber
patent: D259727 (1981-06-01), Zierhut
patent: D338038 (1993-08-01), Oka et al.
patent: D338039 (1993-08-01), Takahashi
patent: D355673 (1995-02-01), Takahashi
patent: D374893 (1996-10-01), Yazawa
patent: D378601 (1997-03-01), Sakuno
patent: 2770221 (1956-11-01), Tonkowich

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