Mechanical pencil

Details Mechanical pencil Mechanical pencil

1997-12-01

2000-03-21

Holtje, Martie K.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Marking instrument

D19 57, D19 51, 1906

Patent

active

D04217705

REFERENCES:
patent: D162805 (1951-04-01), Ferber
patent: D338038 (1993-08-01), Oka et al.
patent: D359757 (1995-06-01), Inami et al.
patent: D363308 (1995-10-01), Sekine
patent: D366498 (1996-01-01), Abe et al.
patent: D378761 (1997-04-01), Sekine
patent: D389131 (1998-01-01), Nagaoka
patent: 3424539 (1969-01-01), Jenkins

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