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See The New Mathomat R300 Ruler
CTM9112 Ratios: 1: 20, 25, 50, 75, 100, 125 - Hand scale ruler, 300mm
CTM9112 Ratios: 1: 20, 25, 50, 75, 100, 125 - Hand scale ruler, 300mm
CTM9112 Ratios: 1: 20, 25, 50, 75, 100, 125 - Hand scale ruler, 300mm
CTM9112 Ratios: 1: 20, 25, 50, 75, 100, 125 - Hand scale ruler, 300mm
CTM9112 Ratios: 1: 20, 25, 50, 75, 100, 125 - Hand scale ruler, 300mm

CTM9112 Ratios: 1: 20, 25, 50, 75, 100, 125 - Hand scale ruler, 300mm

$7.95 AUD