191784 ⎘
Hand manipulated computing devices; Devices in which computing is effected by adding, subtracting, or comparing lengths of parallel or concentric graduated scales characterised by construction with rectilinear scales, e.g. slide rule
Sub-classes:Slide rule style flight computer
#2Trigonometer
#3QUICK CONVERSION GUIDE
#4MECHANICAL CALCULATOR
#5MAP DISTANCE CALCULATOR
#6BMI Ruler
#7Information guide
#8Date calculator
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