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RU1805064C
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Converging parabola reproducer
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Device foe reproducing curves
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Instrument for reproducing curve
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Instrument for transforming ellipse in curve of fourth order
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Device for plotting curves
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Instrument for reproducing curves
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Instrument for reproducing curves
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Instrument for reproducing curves
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Device for drawing six-th order curves
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Device for transforming a circumference into a curve
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Drafting tool
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Device for drawing curves
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Device for drawing curves of the fourth order
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Device for drawing curves
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Instrument for drawing spirals
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Device for separation of vegetation impurities from fruits
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Device for reproducing spirals
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