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

Keuffel & Esser K&E Polyphase Slide Rule- Great Condition

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

Vintage Slide Rule

Vintage Keuffel & Esser Co. K&E Slide Rule 4088-3 With Leather Case Pat 1900-08

Keuffel & Esser 4053-3 polyphase slide rule with case, box, & insert, c. 1941

VINTAGE K&E/KEUFFEL & ESSER N4053-5 20" WOODEN POLYPHASE SLIDE RULE & Case!

Vintage Slide Rule Keuffel & Esser K&E Beginner's 4058W Ruler W Original Case