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STAEDTLER Engineer Aluminum Triangular Scale, 12in Metal Ruler with Color-Cod...

Alumicolor 3000 Series 12-Inch Silver Hollow Aluminum Triangular Engineer Sca...

Linex Triangular Scale Ruler White Matte Polysterene Durable Precision Divided

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Kent Triangular Ruler Scale 1:100 200 250 300 400 500 Dimensionally Stable