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See The New Mathomat R300 Ruler
9812 Ratios: 1: 10,20,50,100 - Hand scale ruler, 300mm
9812 Ratios: 1: 10,20,50,100 - Hand scale ruler, 300mm
9812 Ratios: 1: 10,20,50,100 - Hand scale ruler, 300mm

9812 Ratios: 1: 10,20,50,100 - Hand scale ruler, 300mm

$4.95 AUD