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See The New Mathomat R300 Ruler
Ratios: 1: 4,8,16,32
Ratios: 1: 4,8,16,32
Ratios: 1: 4,8,16,32

91012 Ratios: 1: 4, 8, 16, 32 - Hand scale ruler, 300mm

$4.95 AUD