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See The New Mathomat R300 Ruler
Ratios: 1: 792, 1584, 2376, 3168
Ratios: 1: 792, 1584, 2376, 3168
Ratios: 1: 792, 1584, 2376, 3168

91212 Ratios: 1: 792, 1584, 2376, 3168 - Hand scale ruler, 300mm

$4.95 AUD