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 instrument computation logarithmic basic slipstick engineer scaling analogue professional technical equipment evaluate digits wood analog multiply square education used black stationery for engineers students |
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| Logarithmic ruler on black background. Stationery for engineers and students. |
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