Vintage Keuffel & Esser co Ruler Sliding with Leather Case Model 4053 3

K & E Keuffel & Esser Co. 4181-3 Slide Rule with Leather Case Vintage Made N USA

Keuffel & Esser K&E Slide Rule Manual Polyphase Duplex No. 68 2059 Pocket Slide

Scientific Instruments Co. Circular Slide Rule 1962 No. 1290 with Case

Vtg 1961 Slide Rule Keuffel & Esser K-12 Prep K&E Model 681892 and Case

Vintage Keuffel & Esser Co. K&E Slide Rule 4083-3 With Leather Case Made in USA

K & E 4088-3 SLIDE RULE PAT DATE 2.136.169

Vintage 50-60s Sans & Streiffe Slide Rule W/ Leather Case Japan MCM