Frederick Post Co., Chicago, founded in 1890, was a distributor of US brand slide rules, and other engineering supplies, which were typically relabeled standard products from well-known manufacturers worldwide. At one time or another Post brand slide rules were made by Dennert & Pape (became Aristo), Nestler, A.W. Faber (became Faber-Castell), Hemmi, Lawrence Engineering Service, Charvoz-Roos, Grafton Plastics (who sold to Bruning, Deietzgen, and Compass) and Gilson. Post also sold branded slide rules from Richardson, Vicari, Boucher, Sexton, Halden, Chandler, Ritow, and Winslow. Richardson was a supplier to Post in 1912 and Post began importing Sun Hemmi slide rules with the Post brand around 1920. Until about 1932, some Post models were made by various German manufacturers, including Koch, Huxhold & Hannemann from 1925 to 1930. During. WWII, Charvoz-Roos and Lawrence supplied slide rules that were branded with the Post name. After WWII, Frederick Post again worked with Sun Hemmi to rebrand slide rules From 1945 to April 1952 they were labeled "Made In Occupied Japan" (MIOJ). After April 1952, slide rules were just stamped "Made In Japan" as before the war. Teledyne acquired Post in December 1967. Some Versalogs began to be labeled with the Teledyne brand in late 1969. The Versalog 1460 made specifically for Post by Hemmi is their most well-known and collected slide rule. Teledyne Post, in Des Plaines, Illinois, as a slide rule company, was disbanded in 1992.

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