Four (4) linear slide rules, made by Hemmi, Japan. 1st item: Sun Hemmi No. 154 Electronic slide rule. Comprised of two-sided white celluloid on bamboo, two (2) plastic indicators housed in a metal and plastic frame, and metal end pieces. Includes one (1) black cardstock case. Slide rule: 22 1/2" L. Case: 23 1/2" L x 2 3/4" W x 1" D. 2nd item: Post Simplex No. 1454. Comprised of white celluloid on bamboo, plastic indicator housed in a metal and plastic frame, front, white celluloid and plastic, back. Maker's marks and model number, front. Includes one (1) brown leather case. Slide rule: 22 1/2" L. Case: 22 1/2" L x 2 1/4" W x 3/4" D. 3rd item: Post No. 1461 Pocket Versalog slide rule. Comprised of two-sided white celluloid on bamboo, plastic indicator housed in a metal frame, and metal end pieces. Maker's marks, front and back. Includes one (1) fitted walnut presentation case. Slide rule: 12 3/4" L. Case: 1 1/8" H x 14" W x 3 1/4" D. 4th item: Sun Hemmi No. 44 slide rule. Comprised of two-sided white celluloid on bamboo, plastic indicator housed in a metal and plastic frame. Maker's marks, front, model number, back. Includes one (1) black leatherette case. Slide rule: 6" L. 6 1/2" L x 1 1/2" W x 1/2" D. Provenance: Private West Tennessee Collection. Condition: All items in overall good condition with wear to be expected from age and manner of use. 1st-2nd items: Case with wear, areas of black tape repair.