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 top computation slip wooden slipstick professional square analog count factor functions work measurement numeric closeup abacus mathematical view computing logarithmic black stationery for engineers students |
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| Logarithmic ruler on black background. Stationery for engineers and students, |
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