Notes: "1) Used to calculate atomic fallout dose calculations 2) An interesting calculator designed by LCDR J.C. LeDOUX & LCDR A.C. Perkins, US Navy Base Port Hueneme, CA in 1959 3) No manufacturer listed - apparently designed and built by these two Navy Lieutenant Commanders 4) ""Radiation Slide Rule For Passive Defense Problems"" published in The Military Engineer, July-August 1959."
