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Johnson 1817-0000 Architect's Rule
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- Aluminum extruded triangular ruler with anodized finish
- Laser etched gradations and numbers
- Ideal for architects, engineers and drafting
- U.S. Standard: 12" scale divided in 3, 1-1/2, 1, 3/4, 3/16, 3/32, 1/2, 1/4, 1/8, inch per foot and one division in 1/16 inch