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See The New Mathomat R300 Ruler
Ratios: 1: 48, 96, 192, 384
Ratios: 1: 48, 96, 192, 384
Ratios: 1: 48, 96, 192, 384

91112 Ratios: 1: 48, 96, 192, 384 - Hand scale ruler, 300mm

$4.95 AUD