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See The New Mathomat R300 Ruler
CTM9512 Ratios: 1: 20,33.3,40,50,80,100 - Hand scale ruler, 300mm
CTM9512 Ratios: 1: 20,33.3,40,50,80,100 - Hand scale ruler, 300mm
CTM9512 Ratios: 1: 20,33.3,40,50,80,100 - Hand scale ruler, 300mm
CTM9512 Ratios: 1: 20,33.3,40,50,80,100 - Hand scale ruler, 300mm
CTM9512 Ratios: 1: 20,33.3,40,50,80,100 - Hand scale ruler, 300mm

CTM9512 Ratios: 1: 20,33.3,40,50,80,100 - Hand scale ruler, 300mm

$7.95 AUD