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The Fountain Pen Patent Archive

The instruments that put ink under pressure

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Slide-operated ink flow

Patent drawing of a slender fountain pen holder with a knobbed cap, showing four figures: full-length exterior views (Figs. 1 and 2) with an internal elastic strip and finger slide near the nib, and two cross-sectional close-ups (Figs. 3 and 4) illustrating the valve strip in closed and open positions.

IMPROVEMENT IN FOUNTAIN-PENS.Francis C. Cone · October 11, 1870

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