Sun Hemmi-256 Radio Communications
Here is a scan done by the ISRM of the 1958 Hemmi Slide Rules Catalog:
Hemmi_1958_Catalog.pdfClick on the next link to see professional panoramic pictures of the 256 model.
Click on the next link to see professional panoramic pictures of the 256 model.
References:
Smith Hughes, Richard: Specialized Slide Rules for Electronic Engineers: A Critical Review, My world and Welcome to It. Journal of the Oughtred Society, Volume 19, Number 1, Spring 2010. https://osgalleries.org/journal/pdf_files/19.1/V19.1P47.pdf