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Alvin Tru-Angle Adjustable Drafting Triangle 10" Model 110C - $10 (Brookline)
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Adjustable Triangle - Provides the features of a 45°/90° adjustable triangle plus those of a protractor. Angles from 0° to 90° can be drawn from the baseline with 1/2° accuracy. $10 or best offer. Like-new condition. Pick up in Brookline.