logarithmic ruler black background stationery for engineers and students |
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| navigate by keyword : background computer retro vintage school construction rule calculation multiplication math antique mathematics tool calculator engineering calculate science old white slide isolated ruler division scale score slider logarithms exponents invention trigonometry function technical computing functions evaluate precision numbers view plastic scaling analogue closeup scientific measurement engineer digits student factor logarithm work logarithmic black stationery for engineers students |
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| Logarithmic ruler on black background. Stationery for engineers and students, |
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