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template is Audio
[Audio recording of William P. Lear discussing his life story (Part 3 of 3)]
template is Document
["Directional radio system (Case 17-2)" -- patent application [RM files], 1940]
template is Document
["Radio direction finding system (Case 20-1)" -- patent application [RM files], 1940-1943]
template is Document
["Radio automatic guidance system (Case 31-3) and loop antenna system (Can 8-1)," 1940-1943]
template is Image
[Learadio equipment installed in front and rear cockpits]
template is Image
[Learadio panel assembly]
template is Image
[Learadio automatic direction finder]
template is Image
[Douglas DC-3 instrument panel with Learadio ADF 8]
template is Document
["Learadio Airport Localizer (L-P-2)", 1939 September - October]
template is Document
Learadio notes on direction finding!
template is Document
["Radio guidance system and blind approach system (WPL/30-1)," 1935 June - 1944 November]