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Triangular reduction scale rule. Metric Scales: 1:10, 1:15, 1:20, 1:25, 1:33, 1:50, 1:100, 1:150, 1:200, 1:250, 1:500 Made of white dimensionally stable plastic. The precision divisions are numerated both ways. Dimension markings in cm and m for easier working. With 2 coloured flutings.
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