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See The New Mathomat R300 Ruler
91412 Ratios: 1: 120, 240, 360, 480 - Hand scale ruler, 300mm
91412 Ratios: 1: 120, 240, 360, 480 - Hand scale ruler, 300mm
91412 Ratios: 1: 120, 240, 360, 480 - Hand scale ruler, 300mm

91412 Ratios: 1: 120, 240, 360, 480 - Hand scale ruler, 300mm

$4.95 AUD