Pen point of a ball-point pen

Office supplies; artists and teachers materials – Equipment for writing – drawing – or for fine arts – Element or attachment

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D19 51, 1906

Patent

active

D04084519

REFERENCES:
patent: D157918 (1950-03-01), Stewart
patent: D267655 (1983-01-01), Verona
patent: 2957453 (1960-10-01), Eckerle
patent: 3251344 (1966-05-01), Dorna et al.
patent: 3526522 (1970-09-01), Seregely
patent: 4311403 (1982-01-01), Liguori
patent: 4536099 (1985-08-01), Kiricoples
patent: 4842433 (1989-06-01), Otsuka
patent: 5000605 (1991-03-01), Schneider

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