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![[William P. and Moya Olsen Lear Papers, Box 4, Folder 23; Box 200, Folder 1; Box 209, Folder 1 - ADF-6 and ADF-7 -- notes and diagrams [RM files], 1939 February - 1940 March]](https://digitalcollections.museumofflight.org/files/square_thumbnails/bd966303e3515535eafe85244e06f44c.jpg "[William P. and Moya Olsen Lear Papers, Box 4, Folder 23; Box 200, Folder 1; Box 209, Folder 1 - ADF-6 and ADF-7 -- notes and diagrams [RM files], 1939 February - 1940 March]")
Items from Box 4, Folder 23; Box 200, Folder 1; and Box 209, Folder 1 of the William P. and Moya Olsen Lear Papers, February 1939 to March 1940. Contains notes and diagrams related to ADF-6 and ADF-7 automatic direction finders. 11 total items.