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The top documents tagged [viscous ink]
HISTORY: The modern ball point pen was invented in 1938 by the Argentine-Hungarian journalist In the 1930s Bíró was working as the editor of a small newspaper
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Project Report on Pen
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A ballpoint pen. How does it work? In the tip of the pen there is a small metal sphere. One internal tube filled with a viscous ink is above the ball
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A ballpoint pen
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