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See The New Mathomat R300 Ruler
92212 Ratios: 1:1, 2, 5, 10 - Hand scale ruler, 300mm
92212 Ratios: 1:1, 2, 5, 10 - Hand scale ruler, 300mm
92212 Ratios: 1:1, 2, 5, 10 - Hand scale ruler, 300mm

92212 Ratios: 1:1, 2, 5, 10 - Hand scale ruler, 300mm

$4.95 AUD