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The Evolution of Modern Ballpoint Pen: A Patent History - IPWatchdog.com | Patents & Intellectual Property Law
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Original 1903 Lever-Filled Fountain Pen patent assignment given to inventor and manufacturer John Barnes of the W. F. & John Barnes Company | John Barnes
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Pen shots and thoughts: Early history of Paper Mate – Part 2: The Deluxe model (mid 1950 – mid 1954)
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Ball-point Pen Mechanism Vintage Patent Hand Drawing" Art Board Print for Sale by TheYoungDesigns | Redbubble
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