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 precision number logarithm numbers student top tangent wooden slip scientific research count symbol function plastic slipstick wood scaling evaluate mathematical logarithmic black stationery for engineers students |
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| Logarithmic ruler on black background. Stationery for engineers and students. |
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