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See The New Mathomat R300 Ruler
Ratios: 1: 25,50,100,200
Ratios: 1: 25,50,100,200
Ratios: 1: 25,50,100,200

9012 Ratios: 1: 25, 50,100, 200 - Hand scale ruler, 300mm

$4.95 AUD