Five (5) boxed linear slide rulers, including Keuffel & Esser (K & E), Scientific Instruments Company, Post, and Sun Hemmi, one (1) Gerber GraphAnalogue, and one (1) Keuffel & Esser instruction manual, 7 items total. 1st item: Keuffel & Esser Analon 68 1400, serial number 006399. Comprised of one-sided white Ivorite (plastic), frameless plastic indicator with white plastic edges, and brass-colored end pieces. Maker's marks, front and back. Includes orange leather case, instruction manual, and original box. Slide rule – 12 1/2" L. Case – 13" H x 3 1/8" W x 1" D. Box – 14 3/8" H x 7" W x 1 1/2" D. 2nd item: Keuffel & Esser 68-1251 Jet-Log, serial number 136895. Comprised of two-sided white celluloid, frameless plastic indicator with plastic edges held together with metal screws, and L-shaped metal end pieces. Maker's marks, front and back. Includes orange leather case and original box. Slide rule – 12 1/2" L. Case – 13 1/4" H x 2 3/4" W x 1 1/4" D. Box – 13 3/4" H x 3 1/4" W x 1 1/4" D. 3rd item: Scientific Instruments Company 1510 Astrolog, serial number 30570, made by Relay/Ricoh, Japan. Comprised of two-sided white celluloid, frameless plastic indicator with plastic edges held together with metal screws, and L-shaped metal end pieces. Maker's marks, front and bottom edge. Includes box leather case with original box. Slide rule – 14" L. Case – 14 5/8" H x 3" W x 1 1/8" D. Box – 3 3/8" H x 15" W x 1 1/4" D. 4th item: Post 1451 Pocket Versatrig, made by Hemmi, Japan. Comprised of two-sided white celluloid on bamboo, frameless plastic indicator with plastic edges held together with metal screws, and metal end pieces. Maker's marks, front and back. Includes brown leather case with pocket clip, instruction manual, and original box. Slide rule – 6 7/8" L. Case 7 1/2" H x 2 1/4" W x 7/8" D. Box – 8 1/2" H x 6" W x 2" D. 5th item: Gerber GraphAnalogue, Model GA-103, No. 500, made by the Gerber Scientific Instrument Company, Hartford. Comprised of one-sided black anodized aluminum, frameless plastic and aluminum indicator held together with metal screws, and aluminum end pieces. Maker's makers, front and interior lid of case. Includes an instruction manual, adjusting wrench, and brown leatherette case with brown velvet lined interior. GraphAnalogue – 5" H x 14 1/4" W x 5/8" D. Case – 1 1/4" H x 15 1/2" W x 6 1/4" D. 6th item: Sun Hemmi No. 70, made in Occupied Japan, supplied by Argonauts, South Africa. Comprised of two-sided white celluloid on bamboo, metal and transparent plastic end pieces to each end on back. Maker's marks, back, retailer stick on box. Includes original box. Slide rule – 22 1/4" L. Box – 19 1/4" H x 2 1/2" W x 1 1/8" D. 7th item: K+E Slide Rules: A Self Instruction Manual by Lyman M. Kells, Ph.D., et al., published by Keuffel & Esser Company, New York, Hoboken, circa 1955. 8 3/8" H x 5 1/2" W x 1/2" D. All items mid 20th century. Provenance: Private West Tennessee Collection. CONDITION: All items in overall good condition. 1st item: Wear, area of archival tape repair to box. 2nd item: Box with wear. 3rd item: Slide rule and case with original plastic wrap. Box with wear. Case with surface scratches, ink inscription from previous owner. 4th item: Box with wear. 5th item: Wear to lettering on GraphAnalogue. 6th item: Wear to ruler. Cursor is missing. Wear, area of white tape repair to box. Top third of the box is missing.