Ten (10) Keuffel & Esser (K&E) Slide Rules. 1st item: K&E 4061 Polyphase Duplex slide rule. Comprised of two-sided celluloid coated mahogany, with frameless glass cursor with plastic edges held together with metal screws, and L-shaped metal end pieces. Maker's marks and model number, front and top edge of cursor. Includes one (1) brown leather K & E case. Slide rule: 7 1/4" L. Case: 7 5/8" L. 2nd item: K&E 4061T Polyphase Duplex slide rule. Comprised of two-sided celluloid coated mahogany, with glass "clamshell" cursor in a brass frame, and L-shaped metal end pieces. Maker's marks and model number, front and top edge of cursor. Includes one (1) brown leather case. Slide rule: 7 1/4" L. Case: 7 5/8" L. 3rd item: K&E 4068 Duplex slide rule. Comprised of two-sided celluloid coated mahogany, with glass "clamshell" cursor in a brass frame, and metal end pieces. Maker's marks, front. Includes one (1) brown leather case. Slide rule: 9 7/8" L. Case: 10" L. 4th item: K&E 1747 5 Inch Mannheim slide rule. Comprised of one-sided celluloid coated mahogany, front, laminated paper label, back. Maker's marks, front. 5 1/2" L. 5th item: K&E 4087 T slide rule, duplex with Trig Scales. Comprised of two sided celluloid covered mahogany with metal framed glass cursor. Maker's marks and patent number, bottom of the base. Housed in a K & E leather case. Slide rule: 22 1/8" L. Case: 22 3/4" L. 6th item: K&E 4051 Mannheim slide rule, comprised of one sided celluloid covered mahogany with 2 metal framed glass cursors. Maker's marks and patent numbers, top. Housed in a K & E original leather case. Slide rule: 20 1/2" L. Case: 20 3/4" L. 7th item: Keuffel & Esser 4051 Mannheim slide rule, comprised of one sided celluloid covered mahogany with 1 metal framed cursor. Maker's marks, top. Housed in a black K & E early case. Slide rule: 20 1/2" L. Case: 20 3/4" L. 8th item: K&E 4051 Mannheim slide rule, comprised of one sided celluloid covered mahogany with metal framed cursor. Maker's mark to cursor. Housed in a black K & E early case. Slide rule: 20" L. Case: 20 3/4" L. 9th item: K&E 4051 Mannheim slide rule, comprised of one sided celluloid covered mahogany with brass-framed cursor. Maker's marks to cursor. Housed in a black K & E early case. Slide rule: 20" L. Case: 20 3/4" L. 10th item: Early Keuffel & Esser Mannheim slide rule, comprised of one sided celluloid covered mahogany with brass chiseled cursor. Maker's marks, top and cursor. Housed in a black K & E early case. Slide rule: 10 3/8" L. Case: 10 5/8" L. Provenance: Private West Tennessee Collection.

All items in overall good condition with wear to be expected from age and manner of use. Areas of tarnish to brass cursor frames and metal end pieces. 1st item: Edge of cursor with two 1/4" areas of loss to glass. 2nd item: Cursor with 3/4" x 7/8" area of loss to glass. 3rd item: Toning to celluloid. Case with wear, stitching is not present to one side. 4th item: Cursor is not present. Ink inscription from previous owner, back.