Check the listing for details. Vintage Bryant Duct Designer Slide Rule. Condition: Used. Listed at 18.36 USD. The Vintage Bryant Duct Designer Slide Rule is a collectible engineering tool from the early 20th century. This slide rule, specifically designed for duct design, is a unique piece for collectors of vintage scientific and engineering equipment. With its intricate design and functionality, it serves as a nostalgic reminder of the precision and craftsmanship of engineering in the past.
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