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| Hoyle Acu-Arc Adjustable Ruler 12 in. adjustable ruler |
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| Eliminates the need for beam compasses, railroad and highway curves. The 12 in. ruling edge is measured in inches and easily adjusted for drawing curves and arcs of any radius from 7 in. to 200 in. and on to infinity. Can also be used to find the radius of existing curves for dimensioning drawings. No. 464 |
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