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See The New Mathomat R300 Ruler
CTM9412 Ratios: 1:400,600,800,900,1500 and 3000 - Hand scale ruler, 300mm
CTM9412 Ratios: 1:400,600,800,900,1500 and 3000 - Hand scale ruler, 300mm
CTM9412 Ratios: 1:400,600,800,900,1500 and 3000 - Hand scale ruler, 300mm
CTM9412 Ratios: 1:400,600,800,900,1500 and 3000 - Hand scale ruler, 300mm
CTM9412 Ratios: 1:400,600,800,900,1500 and 3000 - Hand scale ruler, 300mm

CTM9412 Ratios: 1:400,600,800,900,1500 and 3000 - Hand scale ruler, 300mm

$7.95 AUD