Slide rule
slide rule in increase, closeup
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Keywords:
abacusanalogousarchaiccalculationscalculatorcoefficientcomplicateddateelementengineerequalizationinaccurateindicatorlecturelogarithmmathematicsmechanicalmetreofoldoutresearchresultschoolsslidertechnicaltechniciantechnologyunremembereduselessworker
Username: Helinek
Editorial: No
Width: 3520 pixels
Height: 2346 pixels
Downloads: 3
Image ID: 1572057