Keuffel & Esser Co. Duplex Scientific Engineer Wood Antique Slide Rule c.1920s
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Keuffel & Esser Co. Duplex Scientific Engineer Wood Antique Slide Rule c.1920s:
$12.99
K&E Slide Rule
Keuffel & Esser Company
Merchants Slide Rule
Duplex Rule
Vintage Antique Engineer Ruler
Circa 1922- 1927
This instrument is for performing
various arithmetic algebraic &
trigonometric calculations .
Has scales and a sliding indicator for finding coinciding points on the scale
Front DF CF C D
Back CI D
Helpful for engineers scientists
businesses and students .
Fine craftsmanship made of Genuine
Mahogany Wood Frame with celluloid
laminated surface
Nickel metal side bars .
Indicator slide curser made of metal
rimmed thick genuine glass .
Overall great vintage condition. Each
side of indicator slide is missing 1 tiny screw but it\'s still Functional - see pics .
Imprinted numbers and markings are vivid. Glass is clear. Indicator bar and center both slide easily .
Made by Keuffel & Esser Company New York USA
Useful RARE TO FIND collectible rule.
Please feel free to message seller with any questions prior to offerding .
Will be shipped with postal tracking