Five (5) Keuffel & Esser (K&E) and Pickett linear slide rules, including N-4096 Merchant's Desktop. 1st item: K&E N-4096 Merchant's Desktop slide rule, serial number 694283. Comprised of one-sided celluloid laminated mahogany with one slide scale and metal thumb screw, two stationary scales, glass cursor with metal frame and white celluloid edges held together with metal screws, all mounted at an angle in a black, faux leather case with a hinged lid and metal hardware. Maker's marks, front. Case with "K + E" gilt blind stamp lower right of hinged lid. Slide rule – 21 1/2" L. Case – 3" H x 22 1/4" W x 4 1/8" D. 2nd item: K&E 4083-5 Log Log Duplex Vector, serial number 730486. Comprised of two-sided white celluloid coated mahogany, glass cursor with metal frame and white celluloid edges held together with metal screws, and L-shaped end pieces. Maker's marks, front. Includes an orange leather case. Slide rule – 22 3/8" L. Case – 22 3/4" H x 2 5/8" W x 1 1/8" D. 3rd item: Pickett Model N906-T, Simplex Math & National Fire Sprinkler Corporation Hydraulic Slide Chart, designed by J. O. Edmonds. Comprised of two-sided white coated aluminum, nylon cursor held together with metal screws, and metal end pieces. Maker's marks, front and back. Includes a black leather case with "PICKETT" gilt blindstamp lettering. Slide rule – 12 1/4" L. Case – 13" H x 3" W x 7/8" D. 4th-5th items: Two (2) K&E 4088-3 Polyphase Duplex Slide Rule, serial numbers 343282 and 407955. Comprised of two-sided white celluloid coated mahogany, glass cursor with metal frame and white celluloid edges held together with metal screws, and L-shaped end pieces. Maker's marks, front and edges of cursor. Includes two (s) black faux leather "Polyphase" cases with gilt blind stamp lettering. Slide rules – 12 1/4" L. Cases – 12 1/2" H x 2 1/8" W x 1 1/4" D. All items second quarter/mid 20th century. Provenance: Private West Tennessee Collection. CONDITION: Slides rules with light wear, discoloration. 1st item: Case with wear, oxidation to metal hardware. 2nd item: Cursor is a replacement. Case flap is detached, ink inscriptions from previous owner to case. 3rd item: Case with wear, fading to gilt lettering. 4th-5th items: Case with wear, black tape repair to one case. One with areas of loss to cursor glass, cursor is loose.