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The blind stamp is a stamp designed for the blind people, whose “writing” is using special needle to punch specific dots cave. The stamp has three trolley wheels corresponding to the three lines of braille. Each wheel has eight surface containing four situations of the raised dots. And the raised dots position on each surface is the same with towards surface.
The blinds can turn the wheel and choose the arrangement of the raised dots they want on the up surface. Then press the stamp, and they will get the braille cave under the down surface. It can be more convenience and safe than the needle way.