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Opisometer
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An opisometer is used for measuring the length of curved lines on paper. Useful for measuring distance on a map or getting dimensions off a hand drawn image.
It uses polished nails for gear axles and is held together with two woodscrews. The numbers were printed on sticker material.
It uses polished nails for gear axles and is held together with two woodscrews. The numbers were printed on sticker material.
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