Photo 1 of "SUM +-" Drawing Board - with flaps on each end to hold down the paper

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Photo 1 of "SUM +-" Drawing Board - with flaps on each end to hold down the paperPhoto 2 of "SUM +-" Drawing Board - with flaps on each end to hold down the paperPhoto 3 of "SUM +-" Drawing Board - with flaps on each end to hold down the paperPhoto 4 of "SUM +-" Drawing Board - with flaps on each end to hold down the paper