Writing instruments

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

Patent

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Details

D19 43, D19 56, D19 57

Patent

active

D03398226

REFERENCES:
patent: D155532 (1949-10-01), Morrison
patent: D182162 (1958-02-01), Carreiro
patent: D234225 (1975-01-01), Ito
patent: D253060 (1979-10-01), Itoh
patent: D256136 (1980-07-01), Muller
patent: D258219 (1981-02-01), Oka
patent: D269445 (1983-06-01), Kruckel et al.
patent: D284773 (1986-07-01), Schwartz et al.
patent: D285730 (1986-09-01), Bulwick
patent: D310542 (1990-09-01), Regnault
patent: D319844 (1991-09-01), Grotsch et al.
patent: D319845 (1991-09-01), Grotsch et al.
patent: D320618 (1991-10-01), Grotsch

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