The Vintage A.W. Faber-Castell Castell 861 Slide Rule is a classic piece of engineering and surveying equipment, housed in its original protective case. This slide rule, dating back to 1927, is a testament to precision and accuracy in mathematical calculations. Perfect for engineering or surveying students, professionals, or collectors, this piece showcases the craftsmanship and history of A.W. Faber-Castell.
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