Typescript: assignment of right title and interest of Hays Irrotational Rotor patent (issued June 6, 1944) to Airex Manufacturing Company, Box: 6, Folder: 20. Russell Randolph Hays papers, RH MS 564. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/278188 Accessed May 03, 2024.