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Guru Nanak Institution в Twitter: „Ballpoint Pen Day - 10th June. Brothers Laszlo and Gyorgy Biro invented the #ballpointpen and obtained a patent in June of 1943. #BrothersLaszlo #GyorgyBiro #Ballpoint #FountainPen #Sketch #
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Guernsey, Inc. - Today is National Ballpoint Pen Day! This day commemorates the ballpoint pen and marks the anniversary of the patent filing on June 10, 1943. It was conceived as a
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