Keuffel & Esser Slide Rule Ruler Model 681892 K-12 Prep K&E Case Vintage 60s

Keuffel & Esser Slide Rule Ruler Model 681892 K-12 Prep K&E with Case and instructions Vintage Vtg Dated 1961 Vintage Vtg Measuring tool measure Retro Classroom Learning Tool School homeschool college collegiate workwear work utility construction American History Made in the USA. Great preowned condition with a lot of use and measuring left. The plastic case shows signs of normal dirt and wear as pictured, the instruction book has one torn corner as shown. I haven't tried to clean this, but you can! 6428.20250820 c2