Do you have something to share that would enrich our knowledge about this object? Based on its similarities to that model even the cases are similarI had originally estimated it from the same time period, namely mid to late 's. Smithsonian Website. The transparent insert is for freq. However, it is not listed in the H-O catalog, and apparently wasn't sold by Post until This one-sided bamboo rule is coated with white celluloid only on the front.
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I bought a new Post Versalog for technical college in
Hemmi Duplex Slide Rule Retailed by Post (Versalog 1460)
He retired in Mannheim Duplex Simplex Circular Etc. Skip to main content. Eickenberry Sr personal slide rules used in his career. The following time-line, researched by Denise M.