old slide rule mechanical calculator isolated white background vintage logarithmic ruler |
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| navigate by keyword : accuracy antique calculate calculating calculation calculator closeup concept division drawing education engineer engineering evaluate exponents instrument isolated logarithm logarithmic logarithms mathematic mathematical mathematics measurement mechanical multiplication number object old plastic retro rule ruler scale school science single slide still style symbol tangent technical technology tool top transition trigonometry vintage white |
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| Vintage antique slide ruler, logarithmic scale. Slide logarithmic ruler for mathematical calculations isolated on white background |
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