Keuffel & Esser Slide Rule‎ N.Y. Pat. 1900s Vintage K&E Math Tool w/ Case

Vintage Keuffel & Esser slide rule, a classic calculating instrument. This K&E slide rule, complete with its original case, features intricate markings and a smooth sliding mechanism. The slide rule is marked with "Keuffel & Esser Co. N.Y." and "Pat. June 5, 1900". The case is marked with "173 A". A piece of history and a functional tool for collectors and enthusiasts alike. Keywords: Keuffel & Esser, K&E, Slide Rule, Vintage Slide Rule, Antique Slide Rule, Engineering Tool, Calculating Tool, Math Tool, Collectible Tool, Vintage Instrument, Patented 1900, Scientific Instrument, Engineer Gift, Drafting Tool