Mechanical pencil

Details Mechanical pencil Mechanical pencil

1996-02-12

1997-04-08

Thompson, Martie

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Marking instrument

D19 41, D19 53, D19 56

Patent

active

D03787621

REFERENCES:
patent: D179053 (1956-10-01), Baker
patent: D216490 (1970-01-01), Wakai
patent: D220139 (1971-03-01), DiSpinto
patent: D258219 (1981-02-01), Oka
patent: D303992 (1989-10-01), Grotsch
patent: D327703 (1992-07-01), Katami
patent: 2468258 (1949-04-01), Fahringer et al.
patent: 2676570 (1954-04-01), Fahringer

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