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See The New Mathomat R300 Ruler
7112 Ratios: 1: 5, 10, 20, 50, 100 - Hand scale ruler, 300mm
7112 Ratios: 1: 5, 10, 20, 50, 100 - Hand scale ruler, 300mm
7112 Ratios: 1: 5, 10, 20, 50, 100 - Hand scale ruler, 300mm

7112 Ratios: 1: 5, 10, 20, 50, 100 - Hand scale ruler, 300mm

$4.95 AUD