Mechanical pen

Details Mechanical pen Mechanical pen

1989-03-13

1991-09-10

Holtje, Nelson C.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Marking instrument

D19 41, D19 51, D19 56

Patent

active

D03198456

REFERENCES:
patent: D155532 (1949-10-01), Morrison
patent: D258219 (1981-02-01), Oka
patent: D284773 (1986-07-01), Schwartz et al.
patent: D285730 (1986-09-01), Bulwick
patent: D287603 (1987-01-01), Bruhn
patent: D303992 (1989-10-01), Grotsch
patent: D312478 (1990-11-01), Lecce
patent: D314978 (1991-02-01), Oka

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