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Concise Ruler Circular Slide Rule No. 300 100829
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Concise Circular Slide Rule No. 28N Made In Japan Conversion Table on Back Good
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Bob's Calculators and Slide Rules - Concise
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National Museum of American History
Circular Slide Rules
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Concise Ruler Circular Ruler 300 100829 : Tools & Home Improvement - Amazon.com
National Museum of American History
Circular Slide Rules
Priory Antiques | Takeda Circular Concise Slide Rule.280
CONCISE” CIRCULAR SLIDE RULE No. 28 £7.50 - PicClick UK
Concise 100843 Ruler Circular Slide Rule Weight Calculator Diameter 10 — akibashipping
