[William P. and Moya Olsen Lear Papers, Box 28, Folder 5 - Direction finders, 1926-1941]

Items from Box 28, Folder 5 of the William P. and Moya Olsen Lear Papers, 1926-1941. Contains patent documentation for various aircraft and radio systems: Joseph Dugan's synchronous bomb sight, Dugan's radio direction and position indicating system, William L. Jacke's automatic radio tuning control, John H. Hammond Jr.'s system of radiodirective control, Warren S. Eaton's radiodynamic orientation means and method, Martin L. Patteron's radio direction and position finder, Eaton's method and apparatus for determining position, and Hammond's system of radiocontrol. Eight total documents.