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See The New Mathomat R300 Ruler
CTM9712 Ratios: 1: 20,25,33.3,50,75,100 - Hand scale ruler, 300mm
CTM9712 Ratios: 1: 20,25,33.3,50,75,100 - Hand scale ruler, 300mm
CTM9712 Ratios: 1: 20,25,33.3,50,75,100 - Hand scale ruler, 300mm
CTM9712 Ratios: 1: 20,25,33.3,50,75,100 - Hand scale ruler, 300mm
CTM9712 Ratios: 1: 20,25,33.3,50,75,100 - Hand scale ruler, 300mm

CTM9712 Ratios: 1: 20,25,33.3,50,75,100 - Hand scale ruler, 300mm

$7.95 AUD