Four in one pen holder

Office supplies; artists and teachers materials – Office equipment not elsewhere specified – Holder or file

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D10 2, D10 57, D19 36, D19 77, 1906

Patent

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D03870936

REFERENCES:
patent: D177917 (1956-06-01), Luft
patent: D182270 (1958-11-01), Brown
patent: D214768 (1969-07-01), Hillis
patent: D254853 (1980-04-01), Grunstad
patent: D298953 (1988-12-01), Roberts
patent: D314308 (1991-02-01), Cogswell
patent: D314689 (1991-02-01), Claudias
patent: D334949 (1993-04-01), Evenson
patent: 3468048 (1969-09-01), Smith

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