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    1月 10
    enochliew: Constrained Ball by Giha Woo Easily attached to a pen, it helps to draw straight lines without using a ruler. The length of a line can be measured accurately by calculating the turns of the wheel.

    enochliew:

    Constrained Ball by Giha Woo

    Easily attached to a pen, it helps to draw straight lines without using a ruler. The length of a line can be measured accurately by calculating the turns of the wheel.

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