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The Fountain Pen Patent Archive

The instruments that put ink under pressure

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Air-inlet tube

Patent drawing showing five cross-sectional and detail views of a stylographic fountain pen, including the full pen assembly with cap B, handle A, air-tube E, point-section A', and needle J, plus magnified details of the coupling tube F and flanged guide tube G.

STYLOGRAPHIC FOUNTAIN-PEN.Charles H. Downes and Charles L. Downes · July 13, 1880

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