Plural nibbed mechanical pencil

Details Plural nibbed mechanical pencil Plural nibbed mechanical pencil

1992-05-11

1993-09-14

Holtje, Nelson C.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Plural or combined

Patent

active

D03393771

REFERENCES:
patent: D273395 (1984-04-01), Wilkinson
patent: D289368 (1987-04-01), Mann
patent: D303124 (1989-08-01), Li
patent: D306315 (1990-02-01), Shintani
patent: D312658 (1990-12-01), Sumino
patent: D324879 (1992-03-01), Morgan
patent: 1727110 (1929-09-01), Lecroy
patent: 3170440 (1965-02-01), Levoin
patent: 3442595 (1969-05-01), Dumas
patent: 4185933 (1980-01-01), Zebell
patent: 4738558 (1988-04-01), Hiromori

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