April 1, 2024
**RARE THACHER K & E 4012 ENGINEERING CALCULATOR, CYLINDRICAL SLIDE R**
Pricing & History
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Thachers Slide Rule was produced by the famous Keuffel and Essen Company of New York. This is Model 4012 with a serial number 2789. A fairly early model. Excellent condition with all paper intact and legible. Very Rare Collectible piece to add to your collection.
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