Ball-point pen

Office supplies; artists and teachers materials – Equipment for writing – drawing – or for fine arts – Marking instrument

Patent

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Details

D21163

Patent

active

D03059103

REFERENCES:
patent: D123685 (1940-11-01), Sokoloff
patent: D155996 (1949-11-01), Gowland
patent: D163779 (1951-06-01), Ulvad
patent: D271121 (1983-10-01), Hoerlein
patent: D288220 (1987-02-01), Su
patent: D298263 (1988-10-01), Perry et al.

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