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    4 Color Pen: Versatile Tool for Note-Taking and Creativity

    February 24, 2025 - By Himmel

    History of the 4-Color Pen The 4 color pen, a simple yet ingenious invention, has a rich history. Its journey began in the mid-20th century, aiming to provide users with multiple ink choices in a single barrel. The initial model contained four ink colors—blue, black, red, and green. These colors…

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