Chalk marker

Details Chalk marker Chalk marker

1987-03-02

1990-07-10

Holtje, Nelson C.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

Marking instrument

D19 35, D19 49

Patent

active

D03091562

REFERENCES:
patent: D140953 (1945-04-01), Inquier
patent: D221812 (1971-09-01), Locatelli
patent: 522433 (1894-07-01), Schaefer
patent: 1995142 (1935-03-01), Barden
patent: 2105621 (1938-01-01), Testi
patent: 3708236 (1973-01-01), Greenwood
patent: 4579134 (1986-04-01), Moore
patent: 4622985 (1986-11-01), Jankewitz

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