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Some were thin, flat disks, pink or gray, approximately 2 inches (51 mm) in diameter by 1 ⁄ 8 inch (3.2 mm) thick, with a brush attached from the center, while others looked like pink pencils, with a sharpenable eraser at the "lead" end and a stiff nylon brush at the other end. Either way, these tools made possible erasure of individual typed ...